SCHEDULE 14A

                     INFORMATION REQUIRED IN PROXY STATEMENT

                            SCHEDULE 14A INFORMATION

                Proxy Statement Pursuant to Section 14(a) of the
                         Securities Exchange Act of 1934

Filed by the Registrant                                       [X]

Filed by a Party other than the Registrant                    [ ]

Check the appropriate box:

[ ] Preliminary Proxy Statement                  [ ] Confidential, For Use of
[X] Definitive Proxy Statement                       the Commission Only (as
[ ] Definitive Additional Materials                  permitted by Rule
[ ] Soliciting Material Pursuant to Rule 14a-12      14a-6(e)(2))

                                   ----------

                   MELLON INSTITUTIONAL FUNDS INVESTMENT TRUST
                (Name of Registrant as Specified in its Charter)

                                   ----------

Payment of Filing Fee (Check the appropriate box):

[X] No fee required.

[ ] Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.

    (1) Title of each class of securities to which transaction applies:

    (2) Aggregate number of securities to which transaction applies:

    (3) Per unit price or other underlying value of transaction computed
        pursuant to Exchange Act Rule 0-11:

    (4) Proposed maximum aggregate value of transaction:

    (5) Total fee paid:

[ ] Fee paid previously with preliminary materials.

[ ] Check box if any part of the fee is offset as provided by Exchange Act
    Rule 0-11(a)(2) and identify the filing for which the offsetting fee was
    paid previously. Identify the previous filing by registration statement
    number, or the form or schedule and the date of its filing.

    (1) Amount Previously Paid:

    (2) Form, Schedule or Registration Statement No.:

    (3) Filing Party:

    (4) Date Filed:



                   MELLON INSTITUTIONAL FUNDS INVESTMENT TRUST

                  Standish Mellon Short-Term Fixed Income Fund
                                One Boston Place
                           Boston, Massachusetts 02108
                                 1-800-221-4795

                   NOTICE OF A SPECIAL MEETING OF SHAREHOLDERS
                          To be held on April 29, 2005

      A Special Meeting of Shareholders (the "Meeting") of the Standish Mellon
Short-Term Fixed Income Fund (the "Fund") will be held on Friday, April 29, 2005
at 10:00 a.m. (Eastern time) at the offices of Standish Mellon Asset Management
Company LLC, One Boston Place, 34th Floor, Boston, Massachusetts 02108, to
consider and act upon the following proposal, and to transact such other
business as may properly come before the Meeting:

      1.    A proposal to approve the liquidation and dissolution of the Fund
            pursuant to a Plan of Liquidation and Dissolution.

      2.    To consider any other business that may properly come before the
            Meeting.

THE BOARD OF TRUSTEES OF MELLON INSTITUTIONAL FUNDS INVESTMENT TRUST UNANIMOUSLY
RECOMMENDS THAT YOU VOTE IN FAVOR OF THE PROPOSAL TO LIQUIDATE AND DISSOLVE THE
FUND.

      Shareholders of record of the Fund at the close of business on March 1,
2005 will be entitled to vote at the Meeting and at any adjournment(s). The
Proxy Statement and Proxy Card are being mailed to shareholders on or about
March 11, 2005.

                      By Order of the Board of Trustees,

                      Patrick J. Sheppard, President and Chief Executive Officer

Boston, Massachusetts
March 11, 2005

  PLEASE MARK, SIGN, DATE AND RETURN THE ENCLOSED PROXY CARD WHETHER OR NOT YOU
                          EXPECT TO ATTEND THE MEETING.

                                       2



                   MELLON INSTITUTIONAL FUNDS INVESTMENT TRUST

                  STANDISH MELLON SHORT-TERM FIXED INCOME FUND
                                One Boston Place
                           Boston, Massachusetts 02108

                                 PROXY STATEMENT

      This Proxy Statement contains the information you should know before
voting on the proposals summarized below.

                                  INTRODUCTION

This Proxy Statement is being used by the Board of Trustees (the "Board") of
Mellon Institutional Funds Investment Trust (the "Trust") to solicit proxies to
be voted at a Special Meeting of Shareholders (the "Meeting") of the STANDISH
MELLON SHORT-TERM FIXED INCOME FUND (the "Fund"). The Meeting is expected to be
held at the offices of Standish Mellon Asset Management Company LLC, One Boston
Place, 34th Floor, Boston, Massachusetts 02108 at 10:00 a.m. (Eastern time) on
Friday, April 29, 2005, for the purposes set forth in the accompanying Notice of
Special Meeting of Shareholders.

      This Proxy Statement and the enclosed Proxy Card are being mailed to
shareholders on or about March 11, 2005. THE FUND WILL FURNISH, WITHOUT CHARGE,
A COPY OF ITS MOST RECENT ANNUAL REPORT AND MORE RECENT SEMI-ANNUAL REPORT, IF
ANY, TO A SHAREHOLDER UPON REQUEST. Shareholders may request a copy of these
reports by writing to the Mellon Institutional Funds, P.O. Box 8585, Boston,
Massachusetts 02266, by calling 1-800-221-4795 or by visiting our web site at
www.melloninstitutionalfunds.com. The annual report for the Fund for its most
recently completed fiscal year was previously mailed to shareholders.

      The Trustees of the Trust know of no business other than that mentioned in
the Notice that will be presented for consideration at the Meeting. Should other
business properly be brought before the Meeting, proxies will be voted in
accordance with the best judgment of the persons named as proxies.

WHO IS ELIGIBLE TO VOTE

      Shareholders of record of the Fund as of the close of business on March 1,
2005 (the "Record Date") are entitled to vote on all of the Fund's business at
the Meeting and any adjournments thereof. Each share is entitled to one vote. A
fractional share is entitled to the corresponding fraction of one vote. Shares
represented by properly executed proxies will be voted according to the
shareholder's instructions unless revoked before or at the Meeting. If you sign
a proxy, but do not fill in a vote, your shares will be voted FOR the proposal
to liquidate and dissolve the Fund. If any other business comes before the
Meeting, your shares will be voted at the discretion of the persons named as
proxies.


                                       3


                                   PROPOSAL 1
                 APPROVAL OF PLAN OF LIQUIDATION AND DISSOLUTION

      At a meeting held on February 22, 2005, the Board, upon the recommendation
of Standish Mellon Asset Management LLC, the Fund's investment adviser
("Standish Mellon"), determined that it would be in the best interests of the
Fund and its shareholders if the Fund were liquidated and dissolved in
accordance with the Fund's organizational documents and Massachusetts law.
Accordingly, the Board approved the termination of the Fund pursuant to a Plan
of Liquidation and Dissolution (the "Plan"). A copy of the Plan is attached to
this proxy statement as Exhibit A. The Plan provides for the liquidation of the
Fund's assets and the distribution to Fund shareholders of all of the proceeds
of the liquidation. If the shareholders of the Fund approve the proposal, the
net proceeds (after deduction for amounts estimated to be necessary to satisfy
the debts and liabilities of the Fund) will be paid to shareholders pro rata, in
cash, as promptly as possible after the liquidation date.

      Shareholder approval of the Fund's liquidation and dissolution is required
before the Fund can be terminated. For the reasons set forth below, the Board
has unanimously recommended that shareholders vote to approve this Proposal 1
calling for the liquidation and dissolution of the Fund.

SUMMARY OF REASONS FOR TERMINATION.

      The Trustees believe, based upon the information provided by Standish
Mellon, that the termination of the Fund will be in the best interests of the
Fund and the Fund's shareholders for the following reasons:

      -     The Fund's assets have declined significantly over the past several
            years, leaving the Fund too small to remain economically viable;

      -     As a result of the decline in assets, the Fund's expense ratio is at
            a level that would no longer be competitive were it not for the
            continued voluntary fee waiver and expense reimbursement by Standish
            Mellon;

      -     It is unlikely that the Fund will experience sufficient sales of
            Fund shares in the foreseeable future to reverse the decline in
            assets;

      -     Possible alternatives to liquidation, including the merger of the
            Fund into another mutual fund, are not practical under the current
            circumstances and may not be advantageous to the Fund and its
            shareholders.

REASONS FOR TERMINATION

      The Fund commenced operations on July 1, 1995 as a separate series of
Mellon Institutional Funds Investment Trust (the "Trust"). Since its inception,
the Fund has failed to sustain sufficient assets to permit the Fund to operate
efficiently and effectively. At its peak in November 2000, the Fund's assets
were only approximately $52 million. The Fund's assets have since decreased to
approximately $4 million as of January 31, 2005, representing a decline of
approximately 92.3% and an asset level well below what is considered to
constitute the minimum asset size or "critical mass" for a mutual fund and well
below the size of most similar competing mutual funds. This decline has been the
result of redemptions of Fund shares and the lack of any significant offsetting
cash flow from sales of Fund shares.

                                       4



      Standish Mellon has been voluntarily capping the Fund's total expenses by
waiving a portion of its advisory fee and/or reimbursing some of the Fund's
expenses since the Fund's inception on July 1, 1995. The decrease in assets has
resulted in the Fund's annual total expense ratio (without giving effect to the
expense cap) to rise significantly, from 0.60% of net assets for the fiscal year
ended December 31, 2001 to 3.17% of net assets for the fiscal year ending
December 31, 2004. This has in turn required Standish Mellon to increase its
subsidization of the Fund. Standish Mellon has advised the Board that it
believes the Fund's declining asset level and resulting rise in gross expense
ratio has created diseconomies of scale and that the Fund is now too small to
remain economically viable. Standish Mellon does not believe that the Fund's
expense ratio will continue to be competitive with similar funds currently
offered in the market to investors unless Standish Mellon continues voluntarily
to cap the Fund's expenses for the foreseeable future. Standish Mellon has
indicated to the Board that it does not intend to continue the voluntary expense
waiver indefinitely if the liquidation proposal is not approved.

      The Board also considered the historical performance record of the Fund,
and the negative impact that its continuing small asset size and higher expense
ratio would likely have on Fund performance going forward. Standish Mellon has
advised the Board that the Fund's small size has made it difficult to execute
the Fund's investment process effectively. Specifically, the Fund may not easily
take meaningful investment positions in fixed income investments while also
diversifying its assets, in each case, to the extent considered necessary to
invest effectively and in compliance with its diversification policies and
related regulatory requirements. Due to the Fund's small size, Standish Mellon
also has experienced difficulty in negotiating favorable terms with brokers and
dealers on certain Fund portfolio transactions that cannot be aggregated with
transactions for other clients.

      The Board also considered the tax impact on shareholders of the
liquidation and dissolution of the Fund. As of March 7, 2005, the Fund had net
realized losses of approximately $4,835 and net unrealized losses of
approximately $22,932. Based on Standish Mellon's records, Standish Mellon
believes most shareholders in the Fund would realize a loss for tax purposes on
liquidation of the Fund.

      In addition, Standish Mellon has advised the Board that it does not
anticipate that the Fund will experience sufficient asset growth in the future
to reverse this decline in net assets. Standish Mellon believes that the Fund is
not well positioned to attract new assets given the availability of other
similar funds which have significantly lower expense ratios due to larger asset
sizes and superior performance records.

      Prior to recommending the Fund's liquidation to the Board, the officers of
the Fund sought to determine whether a merger or transfer of assets would be
possible, and if so, whether it would produce desirable results for
shareholders. Management reviewed current market conditions, the similarities
between the Fund and other funds managed by Standish Mellon and its affiliates,
the relatively small size of the Fund, the time, effort and expense required to
effect a transaction, and the tax and related implications for shareholders of
such a transaction. The officers determined that there was no suitable
affiliated fund with which the Fund could be combined without significant
changes in its portfolio, including liquidation of significant portions of its
portfolio. They also determined that it was unlikely that an unaffiliated fund
complex would be interested in arranging for the merger or consolidation of a $4
million fund and that the expense of a merger or transfer of the assets to
another mutual fund, affiliated or otherwise, would likely be greater than any
benefits shareholders of the Fund could expect to realize from such a
transaction. The officers also considered the costs involved in the liquidation
and dissolution of the Fund relative to these costs.

      Based on their consideration, analysis and evaluation of the above factors
and Standish Mellon's recommendation, the Trustees (including the Trustees who
are not "interested persons" (the "Independent Trustees") as defined in the
Investment Company Act of 1940, as amended (the "1940 Act")) concluded

                                       5



that an increase in Fund expenses attributable to the decrease in asset size and
the likely discontinuance of the voluntary fee waiver in the future, especially
when added to the expenses of the Fund presently paid directly by the Fund,
would significantly reduce the Fund's returns. Moreover, the Trustees concluded
that the presence of numerous much larger competing funds with similar
objectives that have been able to operate on a more efficient basis and provide
higher returns to shareholders, and in many cases, that have better long term
performance records make it unlikely that the Fund could achieve a significant
increase in asset size and achieve appropriate economies of scale in the future.

      The Board, therefore, concluded that it would be in the best interest of
the Fund and its shareholders to liquidate the Fund promptly, in accordance with
the Plan.

PLAN OF LIQUIDATION AND DISSOLUTION (THE "PLAN").

      The Board of Trustees has approved the Plan as summarized in this section
and as set forth as Exhibit A to this proxy statement.

      1. EFFECTIVE DATE OF THE PLAN AND LIQUIDATION OF THE FUND'S ASSETS. The
Plan will become effective on the date of its adoption and approval by the
holders of a majority of the outstanding shares of the Fund (as defined below).

      Following this approval, the Fund (i) will cease to invest its assets in
accordance with its investment objective and will sell the portfolio securities
it owns in order to convert the Fund's assets to cash or cash equivalent; (ii)
will not engage in any business activities except for the purposes of winding up
its business and affairs, preserving the value of its assets and distributing
its assets to shareholders after the payment to (or reservation of assets for
payment to) all creditors of the Fund; and (iii) will, on a date specified by
the Trust's officers, terminate in accordance with the laws of the Commonwealth
of Massachusetts and the Declaration of Trust of the Fund. (Plan, Sections 1 and
2)

      2. LIQUIDATING DISTRIBUTION. On April 29, 2005, or as soon as practical
thereafter, the Fund on behalf of the Trust will mail the following to each
shareholder of record on the effective date of the Plan: (i) a liquidation
distribution in cash equal to the shareholder's proportionate interest in the
net assets of the Fund (after giving effect to amounts considered necessary to
satisfy the Fund's liabilities); and (ii) information concerning the sources of
the liquidating distribution. (Plan, Section 4)

      3. CESSATION OF RIGHTS OF SHAREHOLDERS. Shares of the Fund automatically
liquidated will no longer be deemed outstanding as of such time and all rights
with respect to those shares will cease at such time. (Plan, Section 7)

      4. EXPENSES. Standish Mellon will bear all expenses incurred by the Fund
in carrying out the Plan, including but not limited to, all printing, legal,
accounting, custodian and transfer agency fees, and the expenses of any reports
to or meeting of shareholders. The total liabilities of the Fund prior to the
liquidating distribution include the dissolution expenses referred to above and
amounts accrued, or anticipated to be accrued, for custodial and transfer agency
services, legal, audit and Trustees fees as well as costs incurred in the
preparation and mailing of proxy materials and related printing costs. Any
expenses and liabilities attributed to the Fund subsequent to the mailing of the
liquidating distribution and for which a reserve has not been established will
also be borne by Standish Mellon. (Plan, Section 5 and 6)

      5. IMPLEMENTATION OF PLAN. After the date of mailing of the liquidating
distribution, the dissolution of the Fund will be effected. The Plan provides
that the Trustees shall have the authority to authorize such variations from or
amendments of the provisions of the Plan as may be necessary or

                                       6



appropriate to marshal the assets of the Fund and to effect the dissolution,
complete the liquidation and terminate the existence of the Fund and otherwise
accomplish the purposes set forth under the Plan. (Plan, Sections 9 and 10)

MATERIAL FEDERAL INCOME TAX CONSEQUENCES.

      Each shareholder who receives a liquidating distribution will recognize
gain (or loss) for federal income tax purposes equal to the amount by which the
cash distributed exceeds (or is less than) the shareholder's tax basis in the
Fund shares. Assuming that the shareholder holds such shares as capital assets,
such gain or loss generally will be treated as long-term capital gain or loss if
the share were held for more than one year and otherwise generally will be
treated as short-term capital gain or loss.

      Notwithstanding the foregoing, any loss realized by a shareholder in
respect of Fund shares with a tax holding period of six months or less will be
treated as long-term capital loss to the extent of any capital gain dividends
with respect to such shares. The federal income tax treatment that a Fund
shareholder would receive if such shareholder's entire interest in the Fund were
redeemed prior to the liquidation generally would be identical to the federal
income tax treatment described above to a shareholder in liquidation of the
shareholder's interest in the Fund.

      The tax consequences discussed herein may affect shareholders differently
depending upon their particular tax situations unrelated to the liquidating
distribution, and accordingly, this summary is not a substitute for careful tax
planning on an individual basis. SHAREHOLDERS MAY WISH TO CONSULT THEIR PERSONAL
TAX ADVISERS CONCERNING THEIR PARTICULAR TAX SITUATIONS AND THE IMPACT THEREON
OF RECEIVING THE LIQUIDATING DISTRIBUTION AS DISCUSSED HEREIN, INCLUDING ANY
STATE, LOCAL AND FOREIGN TAX CONSEQUENCES.

      The Fund anticipates that it will retain its qualification as a regulated
investment company under the Internal Revenue Code, as amended, during the
liquidation period and, therefore, will not be taxed on any of its net income
from the sale of its assets.

      Representatives of PricewaterhouseCoopers LLP, independent registered
public accounting firm for the Fund, are not expected to be present at the
Special Meeting.

      If the shareholders do not approve the Plan, the Fund will continue to
exist as a registered investment company in accordance with its stated objective
and policies. In such a case, the Board would consider what, if any, steps to
take concerning the Fund and its shareholders.

      Shareholders are free to redeem their shares prior to the date on which
shareholders approve the liquidation and dissolution of the Fund.

REQUIRED VOTE.

      As provided under the 1940 Act, approval of the Proposal will require the
vote of a majority of the outstanding voting securities of the Fund. In
accordance with the 1940 Act and as used in this Proposal 1, a "majority of the
outstanding voting securities" of a Fund means the lesser of (a) 67% or more of
the shares of the Fund present at a shareholder meeting if the owners of more
than 50% of the shares of the Fund then outstanding are present in person or by
proxy, or (b) more than 50% of the outstanding shares of the Fund entitled to
vote at the Meeting.

                                       7



           FOR THE REASONS SET FORTH ABOVE, THE TRUSTEES OF THE TRUST
        UNANIMOUSLY RECOMMEND THAT SHAREHOLDERS OF THE FUND VOTE IN FAVOR
                                 OF PROPOSAL 1.

                       INFORMATION CONCERNING THE MEETING

OUTSTANDING SHARES AND QUORUM

      As of March 1, 2005 (the "Record Date"), there were 257,671 common shares
beneficial interest of the Fund outstanding. Only shareholders of record as of
the Record Date are entitled to notice of and to vote at the Meeting. A
majority, or 128,836, of the outstanding shares of the Fund that are entitled to
vote will be considered a quorum for the transaction of business by the Fund.

OWNERSHIP OF SHARES OF THE FUNDS

      As of March 1, 2005, the following persons or entities owned beneficially
of record more than 5% of the outstanding shares of the Fund:



                                                      SHARE OWNERSHIP AS
                                                  PERCENTAGE OF OUTSTANDING
   NAME AND ADDRESS OF SHAREHOLDER                SHARES AS OF MARCH 1, 2005
                                               
DONALDSON LUFKIN & JENRETTE                                 50.27%*
SECURITIES CORPORATION
      P.O. Box 2052
      Attn: Mutual Funds
      Jersey City, NJ 07303

MAC & CO OMNIBUS REINVEST ACCT.                             33.71%*
      C/O Mellon Private Asset Mgt.
      Pittsburgh, PA 15253


      *Because the shareholder beneficially owned more than 25% of the then
outstanding shares of the indicated fund, the shareholder was considered to
control such fund. As a controlling person, the shareholder may be able to
determine whether a proposal submitted to the shareholders of such fund will be
approved or disapproved.

      As of March 1, 2005, none of the Trustees and executive officers of the
Trust owned beneficially or of record, as a group, more than 1% of the
outstanding shares of the Fund.

                                       8


INFORMATION ABOUT THE FUND'S SERVICE PROVIDERS

      Standish Mellon serves as the Fund's investment adviser. Mellon Funds
Distributor, L.P. serves as the Fund's principal underwriter. Each of Standish
Mellon and Mellon Funds Distributor, L.P. are located at One Boston Place,
Boston, MA 02108.

SHAREHOLDER PROPOSALS

      The Fund is not required to hold annual meetings of shareholders and does
not currently intend to hold an annual meeting of shareholders in 2005 whether
or not the Fund is liquidated. Shareholder proposals to be presented at any next
meeting of shareholders of a Fund, whenever held, must be received at the Funds'
principal executive offices, One Boston Place, Boston, Massachusetts 02108, a
reasonable time prior to any such Trustees' solicitation of proxies for any such
meeting. The submission by a shareholder of a proposal for inclusion in a proxy
statement does not guarantee that it will be included. Shareholder proposals are
subject to certain regulations under the federal securities laws.

PROXIES, QUORUM AND VOTING AT THE MEETING

      Shareholders may use the enclosed Proxy Card if they are unable to attend
the Meeting in person or wish to have their shares voted by a proxy even if they
do attend the meeting. Any shareholder that has given his or her Proxy has the
power to revoke that Proxy at any time prior to its exercise by executing a
superseding Proxy or by submitting a notice of revocation to the secretary of
the Trust. In addition, although mere attendance at the Meeting will not revoke
a Proxy, a shareholder present at the Meeting may withdraw his or her Proxy and
vote in person. All properly executed and unrevoked Proxies received in time for
the Meeting will be voted in accordance with the instructions contained in the
Proxies. If no instruction is given, the persons named as proxies will vote the
shares represented thereby in favor of Proposal 1 as described above and will
use their best judgment in connection with the transaction to vote on such other
business as may properly come before the Meeting or any adjournment thereof.

      With respect to the Fund, a majority of the shares entitled to vote,
present in person or represented by Proxy, constitutes a quorum for the
transaction of business with respect to each Proposal (unless otherwise noted in
this Proxy Statement). In the event that, at the time any session of the Meeting
for a Fund is called to order, a quorum is not present in person or by Proxy,
the persons named as proxies may vote those Proxies which have been received to
adjourn the Meeting to a later date. In the event that a quorum is present but
sufficient votes in favor of any proposal have not been received, the persons
named as proxies may propose one or more adjournments of the Meeting to permit
further solicitation of Proxies with respect to such proposal. Any such
adjournment will require the affirmative vote of more than one half of the
shares of the Fund present in person or by Proxy and voting on that particular
proposal at the session of the Meeting to be adjourned. The persons named as
proxies will vote those Proxies which they are entitled to vote in favor of any
such proposal in favor of such an adjournment and will vote those Proxies
required to be voted against any such proposal against any such adjournment. A
shareholder vote may be taken on one or more of the proposals in this Proxy
Statement prior to such adjournment if sufficient votes for its approval have
been received and it is otherwise appropriate. Such vote will be considered
final regardless of whether the Meeting is adjourned to permit additional
solicitation with respect to any other proposal.

      Shares of the Fund represented in person or by Proxy, including shares
which abstain or do not vote with respect to a proposal, will be counted for
purposes of determining whether there is a quorum at the Meeting. Accordingly,
an abstention from voting has the same effect as a vote against a Proposal.
However, if a broker or nominee holding shares in "street name" indicates on the
Proxy Card that it does not have discretionary authority to vote on a proposal,
those shares will not be considered present and

                                       9



entitled to vote on that proposal. Thus, a "broker non-vote" has no effect on
the voting in determining whether a proposal has been adopted by 67% or more of
the Fund's shares present at the Meeting, if more than 50% of the outstanding
shares (excluding the "broker non-votes") of the Fund are present or
represented. However, for purposes of determining whether a proposal has been
adopted by more than 50% of the outstanding shares of a Fund, a "broker
non-vote" has the same effect as a vote against that proposal because shares
represented by a "broker non-vote" are considered to be outstanding shares.

OTHER BUSINESS

      While the Meeting has been called to transact any business that may
properly come before it, the only matters that the Trustees intend to present
are those matters stated in the attached Notice of a Special Meeting of
Shareholders. However, if any additional matters properly come before the
Meeting, and on all matters incidental to the conduct of the Meeting, it is the
intention of the persons named in the enclosed Proxy to vote the Proxy in
accordance with their judgment on such matters unless instructed to the
contrary.

METHOD OF SOLICITATION AND EXPENSES

      The cost of preparing, assembling and mailing this Proxy Statement and the
attached Notice of a Special Meeting of Shareholders and the accompanying Proxy
Card, as well as the costs associated with the proxy solicitation, will be borne
by Standish Mellon. In addition to soliciting proxies by mail, Standish Mellon
may have one or more of its officers, the Fund's officers, representatives or
compensated third-party agents, aid in the solicitation of proxies by personal
interview or telephone and telegraph and may request brokerage houses and other
custodians, nominees and fiduciaries to forward proxy soliciting material to the
beneficial owners of the shares held of record by such persons. Standish Mellon
has retained Management Information Services Corp. ("MIS") to assist in the
solicitation of proxies. The estimated cost for MIS's proxy solicitation
services is approximately $8,000 which will be borne by Standish Mellon.
Shareholders who have not voted their proxies in a timely manner may receive a
telephone call from an officer or employee of Standish Mellon, the Fund or MIS
in an effort to urge them to vote.

      Persons holding shares as nominees will be reimbursed by Standish Mellon,
upon request, for the reasonable expenses of mailing soliciting materials to the
principals of the accounts.

March 11, 2005

                                       10



                                    EXHIBIT A

                   FORM OF PLAN OF LIQUIDATION AND DISSOLUTION

                  STANDISH MELLON SHORT-TERM FIXED INCOME FUND
                                 A SERIES OF THE
                   MELLON INSTITUTIONAL FUNDS INVESTMENT TRUST

                       PLAN OF LIQUIDATION AND DISSOLUTION

      This Plan of Liquidation and Dissolution (the "Plan") concerns the
Standish Mellon Short-Term Fixed Income Fund (the "Fund"), a series of the
Mellon Institutional Funds Investment Trust (the "Trust"), which is a business
trust organized and existing under the laws of the Commonwealth of
Massachusetts. The Fund commenced operations on July 1, 1995. The Trust is
registered as an open-end management investment company registered under the
Investment Company Act of 1940, as amended ("Act"). The Plan is intended to
accomplish the complete liquidation and dissolution of the Fund in conformity
with all provisions of Massachusetts law and the Trust's Agreement and
Declaration of Trust (the "Declaration of Trust").

      WHEREAS, the Trust's Board of Trustees, on behalf of the Fund, has
determined that it is in the best interests of the Fund and its shareholders to
liquidate and dissolve the Fund; and

      WHEREAS, at a meeting of the Board of Trustees on February 22, 2005, the
Board considered and unanimously adopted this Plan as the method of liquidating
and dissolving the Fund and directed that this Plan be submitted to shareholders
of the Fund for approval;

      NOW THEREFORE, the liquidation and dissolution of the Fund shall be
carried out in the manner hereinafter set forth:

      1. EFFECTIVE DATE OF PLAN. The Plan shall be and become effective only
upon the adoption and approval of the Plan, at a meeting of shareholders called
for the purpose of voting upon the Plan, by the affirmative vote of the holders
of a majority of the outstanding voting securities of the Fund, as defined by
Section 2(a)(42) of the Investment Company Act of 1940, as amended. The day of
such adoption and approval by holders of a majority of the outstanding voting
securities of the Fund is hereinafter called the "Effective Date."

      2. LIQUIDATION OF ASSETS. As soon as practicable after the Effective Date,
the Fund shall begin the process of dissolving and winding up its business and
affairs by converting all of its assets to cash or other distributable form
while seeking to preserve the value of the Fund's assets.

      3. DISSOLUTION. On April 29, 2005 or on such date as soon thereafter as
practical if an officer of the Trust determines such delay to be advisable based
upon market conditions and consistent with the terms of the Plan (the
"Liquidation Date"), the Fund shall be dissolved in accordance with the laws of
the Commonwealth of Massachusetts and the Fund's Declaration of Trust.

      4. LIQUIDATING DISTRIBUTION. On the Liquidation Date, the Fund shall send
the following to each shareholder of record on the Liquidation Date:

            (1)   a liquidating distribution in cash equal to the shareholder's
                  proportionate interest in the net assets of the Fund; and

            (2)   information concerning the sources of the liquidating
                  distribution.

                                       A-1



      5. PAYMENT OF DEBTS. As soon as practicable after the Effective Date, the
Fund shall determine and pay, or set aside in cash or cash equivalent, the
amount of all known or reasonably ascertainable liabilities allocable to the
Fund incurred or expected to be incurred on or prior to the Liquidation Date.

      6. EXPENSES OF THE FUND IN LIQUIDATING AND DISSOLVING. Standish Mellon
Asset Management Company LLC, the Fund's investment adviser, shall bear all
expenses incurred by the Fund in carrying out this Plan including, but not
limited to, all printing, legal, accounting, custodian and transfer agency fees,
and the expenses of any reports to or meeting of shareholders.

      7. CESSATION OF RIGHTS OF SHAREHOLDERS. Shares of the Fund automatically
liquidated on the Liquidation Date will no longer be deemed outstanding as of
such time and all rights with respect to those shares will cease at such time.

      8. REPORTING. The Fund will include all of its investment company taxable
income and net capital gain, if any, for its final taxable year in distributions
made to its shareholders pursuant to this Plan or will otherwise timely
distribute such amounts. The Fund will cause its adoption of this plan of
liquidation to be reported to the Internal Revenue Service on Form 966 within 30
days after such adoption.

      9. GENERAL AUTHORIZATION. The officers of the Trust shall have authority
to do or authorize any or all acts and things as provided for in the Plan and
any and all such further acts and things as they may consider necessary or
desirable to carry out the purposes of the Plan, including the execution and
filing of all certificates, documents, information returns, tax returns and
other papers which may be necessary or appropriate to implement the Plan.

      10. AMENDMENT OF PLAN. The Board shall have the authority to authorize
such variations from or amendments to the provisions of the Plan as may be
necessary or appropriate to effect the marshalling of Fund assets and the
dissolution, complete liquidation and termination of the existence of the Fund,
and the distribution of its net assets to shareholders in accordance with the
laws of the Commonwealth of Massachusetts and the purposes to be accomplished by
the Plan.

Executed this ____ day of ________, 2005

                                     MELLON INSTITUTIONAL FUNDS INVESTMENT TRUST

                                     On behalf of Standish Mellon Short-Term
                                     Fixed Income Fund

                                     By: ______________________
                                     Name:
                                     Title:

Accepted:

STANDISH MELLON ASSET
MANAGEMENT COMPANY LLC

By:  ______________________
Name:
Title:

                                       A-2



                   MELLON INSTITUTIONAL FUNDS INVESTMENT TRUST

          -Please fold and detach card at perforation before mailing.-

                                     NOTICE OF A SPECIAL MEETING OF SHAREHOLDERS

STANDISH MELLON SHORT-TERM FIXED INCOME FUND           TO BE HELD APRIL 29, 2005

      This proxy is solicited on behalf of the Board of Trustees of the Mellon
Institutional Funds Investment Trust. The undersigned, revoking all prior
proxies, hereby appoints Denise B. Kneeland, Barbara McCann and Patrick J.
Sheppard, or any of them individually, as proxies, with full powers of
substitution, to vote for the undersigned at the Special Meeting of Shareholders
of the Standish Mellon Short-Term Fixed Income Fund, a series of Mellon
Institutional Funds Investment Trust, to be held on April 29, 2005 at 10:00 a.m.
(Eastern time) at the offices of Standish Mellon Asset Management Company LLC,
One Boston Place, 34th Floor, Boston, Massachusetts, or at any adjournment
thereof. The undersigned acknowledges that s/he has received the Notice of
Special Meeting and the Proxy Statement accompanying the same, which describes
in further detail the matters set forth on the other side of this proxy card.

      The proxies will vote this proxy as directed by the undersigned or, if no
direction is indicated, the proxies will vote this proxy "FOR" the proposal
unless authority to do so is specifically withheld. This proxy also grants
discretionary authority to the proxies to vote upon such other business as may
properly come before the Meeting or any adjournment thereof.

                              -      Date ________________________, 2005

                              PLEASE MARK, SIGN, DATE AND RETURN THIS PROXY
                              CARD, IN THE ENCLOSED ENVELOPE, WHETHER OR NOT YOU
                              EXPECT TO ATTEND THE MEETING.

                                -------------------------------------------
                                          Signature(s) and Title(s),

                              Please sign exactly as your name appear hereon. If
                              stock is held in the name of joint owners, each
                              must sign. Attorneys-in-fact, executors,
                              administrators, etc., should so indicate. If
                              shareholder is a corporation or partnership,
                              please sign in full corporate or partnership name
                              by authorized person.



          -Please fold and detach card at perforation before mailing.-

 - Please fill in box(es) as shown using black or blue ink or number 2 pencil. -
   PLEASE DO NOT USE FINE POINT PENS.

THE BOARD OF TRUSTEES OF THE MELLON INSTITUTIONAL FUNDS INVESTMENT TRUST
UNANIMOUSLY RECOMMENDS THAT YOU VOTE FOR THE PROPOSAL SET FORTH BELOW. Unless
otherwise specified in the squares provided, the undersigned's vote will be cast
FOR the numbered item below.

If you own shares of Standish Mellon Short-Term Fixed Income Fund, please vote
on Proposal 1:

                                                         FOR   AGAINST   ABSTAIN

1. To approve the liquidation and dissolution of         [ ]     [ ]       [ ]
Standish Mellon Short-Term Fixed Income Fund pursuant
to a Plan of Liquidation and Dissolution.

2. To consider any other business that may properly
come before the meeting.