EXHIBIT 99.1
    
                            CAPITOLBANK SACRAMENTO
     THIS REVOCABLE PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS     
    
     The undersigned hereby appoints Thayer T. Prentice, Vice Chairman of the
Board and Chief Executive Officer, and Bernard Rao, Senior Vice President and
Chief Administrative Officer, and each of them, with full power of substitution,
as proxies of the undersigned, to attend the Special Meeting of Shareholders of
CapitolBank Sacramento ("CapitolBank") to be held at 300 Capitol Mall,
Sacramento, California, on Thursday, March 9, 1995 at 5:00 p.m. and any
adjournment or postponement thereof, and to vote the number of shares the
undersigned would be entitled to vote if personally present upon the following
items and to vote according to their discretion on any other matter which may
properly be presented for action at said meeting or any adjournment or
postponement thereof:    
    
     1. TO ADOPT AND APPROVE THE AGREEMENT AND PLAN OF REORGANIZATION DATED AS
        OF NOVEMBER 17, 1994, BY AND BETWEEN WESTAMERICA BANCORPORATION
        ("WESTAMERICA") AND CAPITOLBANK, AN AGREEMENT OF MERGER AMONG
        WESTAMERICA, CAPITOLBANK AND WESTAMERICA MERGER SUBSIDIARY, A WHOLLY-
        OWNED SUBSIDIARY OF WESTAMERICA ("MERGER SUB") AND THE TRANSACTIONS 
        CONTEMPLATED THEREBY, INCLUDING THE MERGER OF MERGER SUB WITH AND INTO 
        CAPITOLBANK.     

           [ ] FOR               [ ] AGAINST          [ ] ABSTAIN

               (To be completed and signed on the reverse side)




 
                          (Continued from other side)
    
     THIS PROXY WILL BE VOTED AS SPECIFIED, OR IF NO CHOICE IS SPECIFIED, THIS 
PROXY WILL BE VOTED "FOR" THE PROPOSAL SET FORTH. Please sign exactly as name
appears. When shares are held by joint tenants, both should sign. When signing
as attorney, executor, administrator, trustee or guardian, please give full
title as such. If a corporation, please provide full corporate name and name and
capacity of the authorized officer signing on behalf of such corporation. If a
partnership, please provide partnership name and name and capacity of the person
signing on behalf of such partnership.     
                                    
                                Dated:_____________________,1995      

                                Signature______________________________________

                                Signature, if held jointly_____________________

     SHAREHOLDERS ARE URGED TO MARK, DATE, SIGN AND RETURN THIS PROXY IN THE 
ENVELOPE PROVIDED, WHICH REQUIRES NO POSTAGE IF MAILED IN THE UNITED STATES.