EXHIBIT 99.1 CAPITOLBANK SACRAMENTO THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS The undersigned hereby appoints Thayer T. Prentice, Vice Chairman of the Board & Chief Executive Officer, and Bernard Rao, Senior Vice President & 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, February 23, 1994 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"), THE MERGER OF MERGER SUB WITH AND INTO CAPITOLBANK AND THE TRANSACTIONS CONTEMPLATED THEREBY. [ ] 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 sign in full corporate name by president or other authorized officer. If a partnership, please sign in a partnership name by authorized person. Dated:_____________________,1994 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.