Page 2 of 14
                                 FORM 10-Q
                                     
                                     
                    SECURITIES AND EXCHANGE COMMISSION
                         WASHINGTON, D. C.  20549

(Mark One)

(X)  QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
     EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 1998

                                    OR

( )  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
     EXCHANGE ACT OF 1934

For the transition period from _________________ to _______________

Commission file number 0-18996

                SOUTHWEST OIL & GAS 1990-91 INCOME PROGRAM
                Southwest Oil and Gas Income Fund X-A, L.P.
                  (Exact name of registrant as specified
                   in its limited partnership agreement)

Delaware                                          75-2310854
(State or other jurisdiction of                        (I.R.S. Employer
incorporation or organization)                         Identification No.)

                       407 N. Big Spring, Suite 300
                  _________Midland, Texas 79701_________
                 (Address of principal executive offices)
                                     
                      ________(915) 686-9927________
                      (Registrant's telephone number,
                           including area code)

Indicate  by  check  mark  whether registrant (1)  has  filed  all  reports
required to be filed by Section 13 or 15(d) of the Securities Exchange  Act
of 1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject  to
such filing requirements for the past 90 days:

                            Yes __X__ No _____
                                     
         The total number of pages contained in this report is 15.



                      PART I. - FINANCIAL INFORMATION

Item 1.  Financial Statements

The  unaudited  condensed financial statements included  herein  have  been
prepared  by  the Registrant (herein also referred to as the "Partnership")
in  accordance  with generally accepted accounting principles  for  interim
financial information and with the instructions to Form 10-Q and Rule 10-01
of Regulation S-X.  Accordingly, they do not include all of the information
and  footnotes  required  by generally accepted accounting  principles  for
complete   financial  statements.   In  the  opinion  of  management,   all
adjustments necessary for a fair presentation have been included and are of
a  normal  recurring nature.  The financial statements should  be  read  in
conjunction with the audited financial statements and the note thereto  for
the  year ended December 31, 1997 which are found in the Registrant's  Form
10-K  Report  for  1997 filed with the Securities and Exchange  Commission.
The December 31, 1997 balance sheet included herein has been taken from the
Registrant's  1997 Form 10-K Report.  Operating results for the  three  and
nine  month periods ended September 30, 1998 are not necessarily indicative
of the results that may be expected for the full year.



                Southwest Oil and Gas Income Fund X-A, L.P.
                                     
                              Balance Sheets

                                              September 30,   December 31,
                                                   1998           1997
                                              -------------   ------------
                                               (unaudited)
Assets

Current assets
 Cash and cash equivalents                     $   24,672          4,408
 Receivable from Managing General Partner               -         40,311
                                                ---------      ---------
     Total current assets                          24,672         44,719
                                                ---------      ---------
Oil and gas properties - using the
 full cost method of accounting                 3,847,669      3,936,664
  Less accumulated depreciation
   depletion and amortization                   3,566,800      3,534,000
                                                ---------      ---------
     Net oil and gas properties                   280,869        402,664
                                                ---------      ---------
                                               $  305,541        447,383
                                                =========      =========

Liabilities and Partners' Equity

Current liabilities
 Distribution payable                          $      555            759
 Payable to Managing General Partner                9,748              -
                                                ---------      ---------
     Total current liabilities                     10,303            759
                                                ---------      ---------
Partners' equity
 General partners                                (23,508)       (11,649)
 Limited partners                                 318,746        458,273
                                                ---------      ---------
     Total partners' equity                       295,238        446,624
                                                ---------      ---------
                                               $  305,541        447,383
                                                =========      =========


                Southwest Oil and Gas Income Fund X-A, L.P.
                                     
                         Statements of Operations
                                (unaudited)


                                Three Months Ended    Nine Months Ended
                                  September 30,         September 30,
                                  1998      1997        1998      1997
                                  ----      ----        ----      ----
Revenues

Oil and gas                  $    58,563   133,671     232,285   420,055
Interest                               -        75          33       368
Miscellaneous                          3     6,003           3     7,653
                                 -------   -------     -------   -------
                                  58,566   139,749     232,321   428,076
                                 -------   -------     -------   -------
Expenses

Production                        79,470    83,112     243,185   280,348
General and administrative        24,212    19,569      75,721    67,653
Depreciation, depletion and
 amortization                      3,800     9,000      32,800    29,000
                                 -------   -------     -------   -------
                                 107,482   111,681     351,706   377,001
                                 -------   -------     -------   -------
Net income (loss)            $  (48,916)    28,068   (119,385)    51,075
                                 =======   =======     =======   =======



Net income (loss) allocated to:

 Managing General Partner    $   (4,061)     3,336     (7,792)     7,207
                                 =======   =======     =======   =======
 General Partner             $     (451)       371       (866)       800
                                 =======   =======     =======   =======
 Limited Partners            $  (44,404)    24,361   (110,727)    43,068
                                 =======   =======     =======   =======
  Per limited partner unit   $    (4.24)      2.32      (10.56)     4.11
                                 =======   =======     =======   =======



                Southwest Oil and Gas Income Fund X-A, L.P.
                                     
                         Statements of Cash Flows
                                (unaudited)


                                                      Nine Months Ended
                                                        September 30,
                                                       1998       1997
                                                       ----       ----
Cash flows from operating activities

 Cash received from oil and gas sales              $  272,551    490,973
 Cash paid to suppliers                             (309,110)  (357,744)
 Interest received                                         33        368
                                                      -------    -------
  Net cash provided by (used in ) operating
   activities                                        (36,526)    133,597
                                                      -------    -------
Cash flows from investing activities

 Additions to oil and gas properties                  (1,221)    (7,916)
 Cash received from sale of oil and gas
  property interest                                    90,216     13,852
                                                      -------    -------
  Net cash provided by investing activities            88,995      5,936
                                                      -------    -------
Cash flows used in financing activities

 Distributions to partners                           (32,205)  (142,997)
                                                      -------    -------
Net increase (decrease) in cash and cash
 equivalents                                           20,264    (3,464)

 Beginning of period                                    4,408      8,919
                                                      -------    -------
 End of period                                     $   24,672      5,455
                                                      =======    =======

                                                             (continued)


                Southwest Oil and Gas Income Fund X-A, L.P.
                                     
                    Statements of Cash Flows, continued
                                (unaudited)


                                                      Nine Months Ended
                                                        September 30,
                                                       1998       1997
                                                       ----       ----
Reconciliation of net income (loss) to net
 cash provided by operating activities

Net income (loss)                                  $(119,385)     51,075

Adjustments to reconcile net income (loss) to
 net cash provided by operating activities

 Depreciation, depletion and amortization              32,800     29,000
 Decrease in receivables                               40,263     63,265
 Increase (decrease) in payables                        9,796    (9,743)
                                                    ---------     ------
Net cash provided by (used in) operating
 activities                                        $ (36,526)    133,597
                                                    =========     ======




Item 2.   Management's  Discussion and Analysis of Financial Condition  and
        Results of Operations

General
Southwest  Oil  &  Gas Income Fund X-A, L.P. was organized  as  a  Delaware
limited  partnership  on  January 29, 1990. The offering  of  such  limited
partnership  interests began on May 11, 1990 as part of  a  shelf  offering
registered  under  the  name Southwest Oil & Gas  1990-91  Income  Program.
Minimum  capital requirements for the Partnership were met  on  August  15,
1990,  with  the  offering of limited partnership interests  concluding  on
November 30, 1990, with total limited partner contributions of $5,242,000.

The  Partnership was formed to acquire interests in producing oil  and  gas
properties,  to produce and market crude oil and natural gas produced  from
such properties, and to distribute the net proceeds from operations to  the
limited  and  general partners.  Net revenues from producing  oil  and  gas
properties will not be reinvested in other revenue producing assets  except
to the extent that production facilities and wells are improved or reworked
or  where methods are employed to improve or enable more efficient recovery
of oil and gas reserves.

Increases   or   decreases   in  Partnership   revenues   and,   therefore,
distributions  to partners will depend primarily on changes in  the  prices
received  for  production,  changes in volumes of  production  sold,  lease
operating  expenses, enhanced recovery projects, offset drilling activities
pursuant  to farm-out arrangements, sales of properties, and the  depletion
of  wells.   Since  wells deplete over time, production  can  generally  be
expected to decline from year to year.

Well  operating costs and general and administrative costs usually decrease
with   production   declines;  however,  these  costs  may   not   decrease
proportionately.  Net income available for distribution to the partners  is
therefore expected to fluctuate in later years based on these factors.

Based  on  current  conditions, management does not  anticipate  performing
workovers  during  the year.  The Partnership could possibly  experience  a
normal decline of 8% to 10% per year.

Oil and Gas Properties
Oil  and  gas  properties  are accounted for at cost  under  the  full-cost
method.  Under this method, all productive and nonproductive costs incurred
in  connection with the acquisition, exploration and development of oil and
gas  reserves  are capitalized.  Gain or loss on the sale of  oil  and  gas
properties  is not recognized unless significant oil and gas  reserves  are
involved.

The  Partnership's policy for depreciation, depletion and  amortization  of
oil  and  gas  properties is computed under the units  of  revenue  method.
Under the units of revenue method, depreciation, depletion and amortization
is  computed  on  the  basis of current gross revenues from  production  in
relation  to future gross revenues, based on current prices, from estimated
production of proved oil and gas reserves.

Should the net capitalized costs exceed the estimated present value of  oil
and gas reserves, discounted at 10%, such excess costs would be charged  to
current  expense.  As of September 30, 1998, the net capitalized costs  did
not  exceed  the  estimated  present value of  oil  and  gas  reserves.   A
continuation  of  the oil price environment experienced  during  the  first
three  quarters  of  1998  will have an adverse  affect  on  the  Company's
revenues  and  operating cash flow.  Also, further declines in  oil  prices
could result in additional decreases in the carrying value of the Company's
oil and gas properties.



Results of Operations

A. General Comparison of the Quarters Ended September 30, 1998 and 1997

The  following  table  provides certain information  regarding  performance
factors for the quarters ended September 30, 1998 and 1997:

                                                 Three Months
                                                    Ended        Percentage
                                                September 30,     Increase
                                                1998      1997   (Decrease)
                                                ----      ----   ---------
Average price per barrel of oil            $   10.60     17.31    (39%)
Average price per mcf of gas               $    2.05      2.79    (27%)
Oil production in barrels                      4,500     6,500    (31%)
Gas production in mcf                          5,300     7,600    (30%)
Gross oil and gas revenue                  $  58,563   133,671    (56%)
Net oil and gas revenue                    $(20,907)    50,559   (141%)
Partnership distributions                  $  10,000    31,000    (68%)
Limited partner distributions              $   9,000    27,900    (68%)
Per unit distribution to limited partners  $     .86      2.66    (68%)
Number of limited partner units               10,484    10,484


Revenues

The  Partnership's oil and gas revenues decreased to $58,563 from  $133,671
for  the  quarters  ended  September 30, 1998  and  1997,  respectively,  a
decrease  of  56%.  The principal factors affecting the comparison  of  the
quarters ended September 30, 1998 and 1997 are as follows:

1.  The  average  price  for a barrel of oil received  by  the  Partnership
    decreased  during the quarter ended September 30, 1998 as  compared  to
    the  quarter  ended  September 30, 1997 by 39%, or  $6.71  per  barrel,
    resulting  in  a  decrease of approximately $43,600 in  revenues.   Oil
    sales  represented  81% of total oil and gas sales during  the  quarter
    ended  September 30, 1998 as compared to 84% during the  quarter  ended
    September 30, 1997.

    The  average  price  for  an  mcf of gas received  by  the  Partnership
    decreased during the same period by 27%, or $.74 per mcf, resulting  in
    a decrease of approximately $5,600 in revenues.

    The  total  decrease in revenues due to the change in  prices  received
    from oil and gas production is approximately $49,200.  The market price
    for  oil  and gas has been extremely volatile over the past decade  and
    management  expects a certain amount of volatility to continue  in  the
    foreseeable future.



2. Oil  production decreased approximately 2,000 barrels or 31% during  the
   quarter  ended  September  30, 1998 as compared  to  the  quarter  ended
   September 30, 1997, resulting in a decrease of approximately $21,200  in
   revenues.

    Gas production decreased approximately 2,300 mcf or 30% during the same
    period, resulting in a decrease of approximately $4,700 in revenues.

    The  total  decrease  in revenues due to the change  in  production  is
    approximately  $25,900.   The  decrease  in  production  is   primarily
    attributable to sale of properties and downtime.

Costs and Expenses

Total  costs  and  expenses decreased to $107,482  from  $111,681  for  the
quarters ended September 30, 1998 and 1997, respectively, a decrease of 4%.
The  decrease  is the result of lower lease operating costs  and  depletion
expense,  partially  offset  by an increase in general  and  administrative
expense

1.    Lease  operating  costs  and  production  taxes  were  4%  lower,  or
   approximately $3,600 less during the quarter ended September 30, 1998 as
   compared to the quarter ended September 30, 1997.

2.  General and administrative costs consist of independent accounting  and
    engineering  fees,  computer services, postage,  and  Managing  General
    Partner  personnel costs.  General and administrative  costs  increased
    24% or approximately $4,600 during the quarter ended September 30, 1998
    as  compared  to the quarter ended September 30, 1997. The increase  in
    general  and administrative costs are due largely to higher  accounting
    fees.   The  10-Q's  are  now  required to be  reviewed  based  on  new
    accounting pronouncements.

3.  Depletion  expense decreased to $3,800 for the quarter ended  September
    30,  1998  from $9,000 for the same period in 1997.  This represents  a
    decrease  of 58%.  Depletion is calculated using the units  of  revenue
    method  of  amortization based on a percentage of current period  gross
    revenues  to  total future gross oil and gas revenues, as estimated  by
    the  Partnership's independent petroleum consultants.  Two contributing
    factors  to  the  decline in depletion expense between the  comparative
    periods were the decrease in the price of oil and the decline in  gross
    oil and gas revenues.





B.   General Comparison of the Nine Month Periods Ended September 30,  1998
and 1997

The  following  table  provides certain information  regarding  performance
factors for the nine month periods ended September 30, 1998 and 1997:

                                                 Nine Months
                                                    Ended        Percentage
                                                September 30,     Increase
                                                1998      1997   (Decrease)
                                                ----      ----   ---------
Average price per barrel of oil            $   12.22     18.06    (32%)
Average price per mcf of gas               $    1.88      2.66    (29%)
Oil production in barrels                     16,500    19,900    (17%)
Gas production in mcf                         16,300    22,880    (29%)
Gross oil and gas revenue                  $ 232,285   420,055    (45%)
Net oil and gas revenue                    $(10,900)   139,707   (108%)
Partnership distributions                  $  32,000   143,000    (78%)
Limited partner distributions              $  28,800   128,700    (78%)
Per unit distribution to limited partners  $    2.75     12.28    (78%)
Number of limited partner units               10,484    10,484

Revenues

The  Partnership's oil and gas revenues decreased to $232,285 from $420,055
for  the  nine  months ended September 30, 1998 and 1997,  respectively,  a
decrease  of  45%.  The principal factors affecting the comparison  of  the
nine months ended September 30, 1998 and 1997 are as follows:

1.  The  average  price  for a barrel of oil received  by  the  Partnership
    decreased  during the nine months ended September 30, 1998 as  compared
    to  the  nine  months ended September 30, 1997 by  32%,  or  $5.84  per
    barrel,  resulting in a decrease of approximately $116,200 in revenues.
    Oil  sales represented 87% of total oil and gas sales during  the  nine
    months  ended  September 30, 1998 as compared to 86%  during  the  nine
    months ended September 30, 1997.

    The  average  price  for  an  mcf of gas received  by  the  Partnership
    decreased during the same period by 29%, or $.78 per mcf, resulting  in
    a decrease of approximately $17,800 in revenues.

    The  total  decrease in revenues due to the change in  prices  received
    from  oil  and  gas production is approximately $134,000.   The  market
    price  for oil and gas has been extremely volatile over the past decade
    and  management expects a certain amount of volatility to  continue  in
    the foreseeable future.



2.  Oil  production decreased approximately 3,400 barrels or 17% during the
    nine  months  ended September 30, 1998 as compared to the  nine  months
    ended  September  30,  1997, resulting in a decrease  of  approximately
    $41,500 in revenues.

    Gas production decreased approximately 6,600 mcf or 29% during the same
    period, resulting in a decrease of approximately $12,400 in revenues.

    The  total  decrease  in revenues due to the change  in  production  is
    approximately $53,900.  The decrease is primarily attributable to  sale
    of properties and downtime.

Costs and Expenses

Total  costs and expenses decreased to $351,706 from $377,001 for the  nine
months  ended September 30, 1998 and 1997, respectively, a decrease of  7%.
The  decrease  is the result of lower lease operating costs  and  depletion
expense,  partially  offset  by an increase in general  and  administrative
expense.

1.  Lease  operating  costs  and  production  taxes  were  13%  lower,   or
    approximately  $37,200 less during the nine months ended September  30,
    1998 as compared to the nine months ended September 30, 1997.

2.  General and administrative costs consist of independent accounting  and
    engineering  fees,  computer services, postage,  and  Managing  General
    Partner  personnel costs.  General and administrative  costs  increased
    12%  or approximately $8,100 during the nine months ended September 30,
    1998  as  compared to the nine months ended September  30,  1997.   The
    increase in general and administrative costs are due largely to  higher
    accounting fees.  The 10-Q's are now required to be reviewed  based  on
    new accounting pronouncements.

3.  Depletion  expense  increased to $32,800  for  the  nine  months  ended
    September  30,  1998 from $29,000 for the same period  in  1997.   This
    represents an increase of 13%.  Depletion is calculated using the units
    of  revenue  method  of amortization based on a percentage  of  current
    period  gross  revenues to total future gross oil and gas revenues,  as
    estimated by the Partnership's independent petroleum consultants.



Liquidity and Capital Resources
The  primary source of cash is from operations, the receipt of income  from
interests in oil and gas properties.  The Partnership knows of no  material
change, nor does it anticipate any such change.

Cash flows provided by or (used in) operating activities were approximately
$(36,500)  in  the  nine months ended September 30,  1998  as  compared  to
approximately  $133,600 in the nine months ended September 30,  1997.   The
primary use of the 1998 cash flow from operating activities was oil and gas
operations.

Cash  flows provided by investing activities were approximately $89,000  in
the  nine  months  ended  September 30, 1998 as compared  to  approximately
$5,900  in the nine months ended September 30, 1997.  The principle  source
of  the 1998 cash flow from investing activities was the change in oil  and
gas properties.

Cash  flows used in financing activities were approximately $32,200 in  the
nine  months ended September 30, 1998 as compared to approximately $143,000
in  the  nine  months ended September 30, 1997.  The only use in  financing
activities was the distributions to partners.

Total  distributions during the nine months ended September 30,  1998  were
$32,000 of which $28,800 was distributed to the limited partners and $3,200
to  the  general  partners.  The per unit distribution to limited  partners
during  the  nine  months  ended  September  30,  1998  was  $2.75.   Total
distributions during the nine months ended September 30, 1997 were $143,000
of  which  $128,700 was distributed to the limited partners and $14,300  to
the general partners.  The per unit distribution to limited partners during
the nine months ended September 30, 1997 was $12.28.

The source for the 1998 distributions of $32,000 was oil and gas operations
of  approximately $(36,500), partially offset by the change in oil and  gas
properties  of  approximately  $89,000,  resulting  with  excess  cash  for
contingencies  or  subsequent distributions.   The  sources  for  the  1997
distributions  of  $143,000  were oil and gas operations  of  approximately
$133,600 and the change in oil and gas properties of approximately  $5,900,
with the balance of available cash on hand at the beginning of the period.

Since  inception of the Partnership, cumulative monthly cash  distributions
of  $2,693,706 have been made to the partners.  As of September  30,  1998,
$2,474,805 or $236.06 per limited partner unit has been distributed to  the
limited partners, representing a 47% return of the capital contributed.

As  of  September  30, 1998, the Partnership had approximately  $14,400  in
working  capital.   The  Managing  General  Partner  knows  of  no  unusual
contractual commitments and believes the revenues generated from operations
are adequate to meet the needs of the Partnership.





Information Systems for the Year 2000

The  Partnership  relies  on the Managing General Partner  for  their  data
processing  requirements.   This includes use of  a  program  designed  and
implemented  by Midland Southwest Software, the Managing General  Partner's
software subsidiary.  Midland Southwest Software currently has a year  2000
plan  in  effect.   They have surveyed existing programs and  hardware  and
estimate a compliance date of early 1999.  Determination of the total  cost
in connection with the year 2000 compliance issue is difficult to determine
due  to the fact that they are in the process of developing their new  1998
version  of  marketed  oil  and gas software, which  has,  from  inception,
included  year 2000 compliance.  Third party software programs utilized  by
the  Managing General Partner are either in compliance or are not  affected
by  the  year  2000,  with the exception of the payroll service,  which  is
currently modifying its system to accurately handle the Year 2000 issue.

The  Managing  General  Partner has not completed  its  evaluation  of  its
vendors  or  suppliers systems to determine the effect, if  any,  the  non-
compliance  of  such systems would have on the operations of  the  Managing
General  Partner.  Plans are under way to perform an audit in late 1998  or
early  1999  to determine the effect of non-compliance of its  vendors  and
suppliers  on the Managing General Partner and thus formulate a contingency
plan.

A  potential source of risk includes, but is not limited to, the  inability
of  principal  purchasers and suppliers to be year  2000  compliant,  which
could  have a material effect on the Managing General Partner's production,
cash  flow  and overall financial condition, notwithstanding  the  Managing
General  Partner's  actions to prepare its own  information  systems.   The
Managing  General  Partner currently does not have a  contingency  plan  in
place to cover any unforeseen problems encountered that relate to the  year
2000, but intends to produce one before the end of the fiscal year.



                        PART II - OTHER INFORMATION
                                     

Item 1.  Legal Proceedings

         None

Item 2.  Changes in Securities

         None

Item 3.  Defaults Upon Senior Securities

         None

Item 4.  Submission of Matter to a Vote of Security Holders

         None

Item 5.  Other Information

         None

Item 6.  Exhibits and Reports on Form 8-K

         (a)Exhibits:

             27 Financial Data Schedule

         (b) No reports on Form 8-K were filed during the quarter for
             which this report is filed.
            
            


                                SIGNATURES


Pursuant  to the requirements of the Securities Exchange Act of  1934,  the
registrant  has duly caused this report to be signed on its behalf  by  the
undersigned thereunto duly authorized.

                                   Southwest Oil and Gas Income Fund X-A,
                                   L.P.
                                   a Delaware limited partnership

                                   By:  Southwest Royalties, Inc.
Managing General Partner


                                   By:  /s/ Bill E. Coggin
                                        ------------------------------
                                        Bill E. Coggin, Vice President
and Chief Financial Officer

Date:     November 15, 1998