CULLEN FROST BANKERS INC
8-A12B, 1999-02-01
NATIONAL COMMERCIAL BANKS
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             SECURITIES AND EXCHANGE COMMISSION

                    Washington, D.C. 20549

                           FORM 8-A

      FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES
          PURSUANT TO SECTION 12(b) OR (g) OF THE
              SECURITIES EXCHANGE ACT OF 1934

                  Cullen/Frost Bankers, Inc.
- -----------------------------------------------------------
   (Exact name of registrant as specified in its charter)


                 Texas                        74-1751768
- ----------------------------------------     --------------
 (State of incorporation or organization)    (IRS Employer 
                                              Identification
                                              No.)

            P.O. Box 1600
            100 West Houston St.
            San Antonio, Texas 78205            78296-1400
- -----------------------------------------      -----------
 (Address of principal executive offices)       (Zip Code)



Securities to be registered pursuant to Section 12(b) of the
Act:

Title of each class           Name of each exchange on which
to be so registered           each class is to be registered
- -------------------           ------------------------------

Stock Purchase Rights         New York Stock Exchange, Inc.



Securities to be registered pursuant to Section 12(g) of the
Act:

                          None                             
- -----------------------------------------------------------
                    (Title of Class)

<PAGE>

Item 1.  Description of Registrant's Securities to be
         --------------------------------------------
         Registered.
         ----------

     On January 26, 1999, the Board of Directors of 
Cullen/Frost Bankers, Inc., a Texas corporation (the 
"Company"), declared a dividend payable on March 15, 1999 of 
one right (a "Right") for each outstanding share of common 
stock, par value $0.01 per share, of the Company held of 
record at the close of business on February 8, 1999, or 
issued thereafter and prior to the Separation Time (as 
defined in the Rights Agreement referred to below) and 
thereafter pursuant to options and convertible securities 
outstanding at the Separation Time.  The Rights will be 
issued pursuant to a Shareholder Protection Rights 
Agreement, dated as of January 26, 1999 (the "Rights 
Agreement"), between the Company and The Frost National 
Bank, as Rights Agent.

     The description of the Rights contained in the 
Company's Current Report on Form 8-K dated January 29, 1999 
is hereby incorporated by reference herein.

     The Rights Agreement (which includes as Exhibit A the 
forms of Rights Certificate and Election to Exercise and as 
Exhibit B the form of Statement of Resolution Establishing A 
Series of Shares of Junior Participating Preferred Stock) is 
attached hereto as an exhibit and is hereby incorporated 
herein by reference.  The description of the Rights 
incorporated by reference to the Company's Current Report on 
Form 8-K, dated January 29, 1999 is qualified in its 
entirety by reference to the Rights Agreement and such 
exhibits thereto.

Item 2.    Exhibits.
           --------

Exhibit No.     Description
- ----------      -----------

    (1)         Rights Agreement.

    (2)         Forms of Rights Certificate and of Election
                to Exercise, included in Exhibit A to the
                Rights Agreement.
		
    (3)         Form of Statement of Resolution Establishing
                A Series of Junior Participating Preferred
                Stock, included in Exhibit B to the Rights
                Agreement.

                      Page 2 of 3 Pages

<PAGE>


                          SIGNATURE

     Pursuant to the requirements of Section 12 of the 
Securities Exchange Act of 1934, the registrant has duly 
caused this registration statement to be signed on its 
behalf by the undersigned, thereunto duly authorized.

                              CULLEN/FROST BANKERS, INC.


                              By /s/Phillip D. Green
                                 ------------------------
                                 Name: Phillip D. Green
                                 Title: Senior Executive
                                        Vice President and
                                        Chief Financial 
                                        Officer


Date: January 29, 1999

                        Page 3 of 3 Pages

<PAGE>

EXHIBIT INDEX
- -------------

Exhibit
Number  Description                                    Method of Filing
- ------- -------------------------------------------    ----------------
 (1)    Rights Agreement                               Filed herewith

 (2)    Forms of Rights Certificate and of Election    Filed herewith
        to exercise, include in Exhibit A to the
        Rights Agreement.

 (3)    Form of Statement of Resolution Establishing   Filed herewith    
        A Series of Junior Participating Preferred
        Stock, included in Exhibit B to the Rights
        Agreement.

<PAGE> 






EXHIBIT 1



                           Rights Agreement

<PAGE>
	

==============================================================================












                   	SHAREHOLDER PROTECTION RIGHTS AGREEMENT

                                 	dated as of

                              	January 26, 1999

                                   	between

                         	CULLEN/FROST BANKERS, INC.

                                    	and

                          	THE FROST NATIONAL BANK









==============================================================================

<PAGE>


                  	SHAREHOLDER PROTECTION RIGHTS AGREEMENT

                             	Table of Contents

                                                                      Page
                                                                      ----  

                                 Article I
                               	DEFINITIONS

Section 1.1    	Definitions ........................................   2

                               	Article II
                               	THE RIGHTS

Section 2.1    	Summary of Rights ..................................  17
Section 2.2    	Legend on Common Stock
                Certificates .......................................  17
Section 2.3    	Exercise of Rights; 
                Separation of Rights ...............................  18
Section 2.4    	Adjustments to Exercise Price;
                Number of Rights ...................................  22
Section 2.5    	Date on Which Exercise is 
                Effective ..........................................  25
Section 2.6    	Execution, Authentication, Delivery
                and Dating of Rights 
                Certificates .......................................  26
Section 2.7    	Registration, Registration of 
                Transfer and Exchange ..............................  27
Section 2.8    	Mutilated, Destroyed, Lost and 
                Stolen Rights Certificates .........................  29
Section 2.9    	Persons Deemed Owners ..............................  30
Section 2.10   	Delivery and Cancellation of 
                Certificates .......................................  31
Section 2.11   	Agreement of Rights Holders ........................  31

                         	Article III
          	ADJUSTMENTS TO THE RIGHTS IN THE EVENT OF 
                     	CERTAIN TRANSACTIONS

Section 3.1    	Flip-in ............................................  33
Section 3.2     Flip-over ..........................................  38

                                 -i-

<PAGE>

                             Article IV
                         	THE RIGHTS AGENT

Section 4.1    	General ............................................  40
Section 4.2     Merger or Consolidation or Change of 
                Name of Rights Agent ...............................  41
Section 4.3     Duties of Rights Agent .............................  42
Section 4.4     Change of Rights Agent .............................  46

                             Article V
                          	MISCELLANEOUS

Section 5.1    	Redemption .........................................  48
Section 5.2    	Expiration .........................................  49
Section 5.3    	Issuance of New Rights
                Certificates .......................................  50
Section 5.4    	Supplements and Amendments .........................  51
Section 5.5     Fractional Shares ..................................  51
Section 5.6     Rights of Action ...................................  52
Section 5.7    	Holder of Rights Not Deemed a
                Shareholder ........................................  53
Section 5.8    	Notice of Proposed Actions .........................  53
Section 5.9    	Notices ............................................  54
Section 5.10    Suspension of Exercisability .......................  55
Section 5.11   	Costs of Enforcement ...............................  56
Section 5.12   	Successors .........................................  56
Section 5.13   	Benefits of this Agreement .........................  56
Section 5.14    Determination and Actions
                by the Board of Directors, etc. ....................  56
Section 5.15   	Descriptive Headings ...............................  57
Section 5.16   	Governing Law ......................................  57
Section 5.17    Counterparts .......................................  57
Section 5.18    Severability .......................................  58

                               	EXHIBITS

Exhibit A       Form of Rights Certificate
                  (Together with Form of 
                  Election to Exercise)

Exhibit B       Form of Statement of Resolution Establishing
               	  Series of Shares of Junior
                  Participating Preferred Stock
 
                                  -ii-
<PAGE>

            SHAREHOLDER PROTECTION RIGHTS AGREEMENT
            ---------------------------------------  

          SHAREHOLDER PROTECTION RIGHTS AGREEMENT (as 
amended from time to time, this "Agreement"), dated as of 
January 26, 1999, between Cullen/Frost Bankers, Inc., a 
Texas corporation (the "Company"), and The Frost National 
Bank, as Rights Agent (the "Rights Agent", which term shall 
include any successor Rights Agent hereunder).

                       	WITNESSETH:
                        ----------

          WHEREAS, the Board of Directors of the Company has 
(a) authorized and declared a dividend of one right 
("Right") in respect of each share of Common Stock (as 
hereinafter defined) held of record as of the close of 
business on February 8, 1999 (the "Record Time") and payable 
in respect of each such share on March 15, 1999 (the 
"Payment Time") and (b) as provided in Section 2.4, 
authorized the issuance of one Right in respect of each 
share of Common Stock issued after the Record Time and prior 
to the Separation Time (as hereinafter defined) and, to the 
extent provided in Section 5.3, each share of Common Stock 
issued after the Separation Time;

          WHEREAS, subject to the terms and conditions 
hereof, each Right entitles the holder thereof, after the 

<PAGE>

Separation Time, to purchase securities or assets of the 
Company (or, in certain cases, securities of certain other 
entities) pursuant to the terms and subject to the 
conditions set forth herein; and
          WHEREAS, the Company desires to appoint the Rights 
Agent to act on behalf of the Company, and the Rights Agent 
is willing so to act, in connection with the issuance, 
transfer, exchange and replacement of Rights Certificates 
(as hereinafter defined), the exercise of Rights and other 
matters referred to herein;
          NOW THEREFORE, in consideration of the premises 
and the respective agreements set forth herein, the parties 
hereby agree as follows:
                        ARTICLE I   
                       	DEFINITIONS
          1.1 Definitions.  For purposes of this Agreement,
              ------------
the following terms have the meanings indicated:

          "Acquiring Person" shall mean any Person who is a 
Beneficial Owner of 10% or more of the outstanding shares of 
Common Stock; provided, however, that the term "Acquiring 
              --------  -------
Person" shall not include any Person (i) who is the 
Beneficial Owner of 10% or more of the outstanding shares of 
Common Stock on the date of this Agreement or who shall 

                            -2-
<PAGE>

become the Beneficial Owner of 10% or more of the 
outstanding shares of Common Stock solely as a result of an 
acquisition by the Company of shares of Common Stock, until 
such time hereafter or thereafter as any of such Persons 
shall become the Beneficial Owner (other than by means of a 
stock dividend or stock split) of any additional shares of 
Common Stock, (ii) who becomes the Beneficial Owner of 10% 
or more of the outstanding shares of Common Stock but who 
acquired Beneficial Ownership of shares of Common Stock 
without any plan or intention to seek or affect control of 
the Company, if such Person promptly divests, or enters into 
an agreement satisfactory to the Company, in its sole 
discretion, pursuant to which it will divest (without 
exercising or retaining any power, including voting power, 
with respect to such shares), sufficient shares of Common 
Stock (or securities convertible into, exchangeable into or 
exercisable for Common Stock) so that such Person ceases to 
be the Beneficial Owner of 10% or more of the outstanding 
shares of Common Stock or (iii) who Beneficially Owns shares 
of Common Stock consisting solely of one or more of 
(A) shares of Common Stock Beneficially Owned pursuant to 
the grant or exercise of an option granted to such Person 
(an "Option Holder") by the Company in connection with an 

                            -3-
<PAGE>

agreement to merge with, or acquire, the Company entered 
into prior to a Flip-in Date, (B) shares of Common Stock (or 
securities convertible into, exchangeable into or 
exercisable for Common Stock), Beneficially Owned by such 
Option Holder or its Affiliates or Associates at the time of 
grant of such option, (C) shares of Common Stock (or 
securities convertible into, exchangeable into or 
exercisable for Common Stock) acquired by Affiliates or 
Associates of such Option Holder after the time of such 
grant which, in the aggregate, amount to less than 1% of the 
outstanding shares of Common Stock and (D) shares of Common 
Stock (or securities convertible into, exchangeable into or 
exercisable for Common Stock) which are held by such Person 
in trust accounts, managed accounts and the like or 
otherwise held in a fiduciary capacity, that are 
Beneficially Owned by third persons who are not Affiliates 
or Associates of such Person or acting together with such 
Person to hold such shares, or which are held by such Person 
in respect of a debt previously contracted.  In addition, 
the Company, any wholly-owned Subsidiary of the Company and 
any employee stock ownership or other employee benefit plan 
of the Company or a wholly-owned Subsidiary of the Company 
shall not be an Acquiring Person.

                             -4-
<PAGE>


          "Affiliate" and "Associate" shall have the respec-
tive meanings ascribed to such terms in Rule 12b-2 under the 
Exchange Act, as such Rule is in effect on the date of this 
Agreement.
          "Agreement" shall have the meaning set forth in 
the preamble.
          A Person shall be deemed the "Beneficial Owner", 
and to have "Beneficial Ownership" of, and to "Beneficially 
Own", any securities as to which such Person or any of such 
Person's Affiliates or Associates is or may be deemed to be 
the beneficial owner of pursuant to Rule 13d-3 and 13d-5 
under the Exchange Act, as such Rules are in effect on the 
date of this Agreement, as well as any securities as to 
which such Person or any of such Person's Affiliates or 
Associates has the right to become Beneficial Owner (whether 
such right is exercisable immediately or only after the 
passage of time or the occurrence of conditions) pursuant to 
any agreement, arrangement or understanding, or upon the 
exercise of conversion rights, exchange rights, rights 
(other than the Rights), warrants or options, or otherwise; 
provided, however, that a Person shall not be deemed the 
- -------- --------
"Beneficial Owner", or to have "Beneficial Ownership" of, or 
to "Beneficially Own", any security (i) solely because such

                             -5-
<PAGE>

security has been tendered pursuant to a tender or exchange
offer made by such Person or any of such Person's Affiliates 
or Associates until such tendered security is accepted for 
payment or exchange or (ii) solely because such Person or 
any of such Person's Affiliates or Associates has or shares 
the power to vote or direct the voting of such security 
pursuant to a revocable proxy given in response to a public 
proxy or consent solicitation made to more than ten holders 
of shares of a class of stock of the Company registered 
under Section 12 of the Exchange Act and pursuant to, and in 
accordance with, the applicable rules and regulations under 
the Exchange Act, except if such power (or the arrangements 
relating thereto) is then reportable under Item 6 of 
Schedule 13D under the Exchange Act (or any similar 
provision of a comparable or successor report).  
Notwithstanding the foregoing, no officer or director of the 
Company shall be deemed to Beneficially Own any securities 
of any other Person by virtue of any actions such officer or 
director takes in such capacity.  For purposes of this 
Agreement, in determining the percentage of the outstanding 
shares of Common Stock with respect to which a Person is the 
Beneficial Owner, all shares as to which such Person is 
deemed the Beneficial Owner shall be deemed outstanding.

                            -6- 
<PAGE>

          "Business Day" shall mean any day other than a 
Saturday, Sunday or a day on which banking institutions in 
San Antonio, Texas are generally authorized or obligated by 
law or executive order to close.
          "Close of business" on any given date shall mean 
5:00 p.m. San Antonio, Texas time on such date or, if such 
date is not a Business Day, 5:00 p.m. San Antonio, Texas 
time on the next succeeding Business Day.
          "Common Stock" shall mean the shares of Common 
Stock, par value $0.01 per share, of the Company.
          "Company" shall have the meaning set forth in the 
preamble.
          "Election to Exercise" shall have the meaning set 
forth in Section 2.3(d) hereof.
          "Exchange Act" shall mean the Securities Exchange 
Act of 1934, as amended.
          "Exchange Ratio" shall have the meaning set forth 
in Section 3.1(c) hereof.
          "Exchange Time" shall mean the time at which the 
right to exercise the Rights shall terminate pursuant to 
Section 3.1(c) hereof.
          "Exercise Price" shall mean, as of any date, the 
price at which a holder may purchase the securities issuable 

                            -7-
<PAGE>

upon exercise of one whole Right.  Until adjustment thereof 
in accordance with the terms hereof, the Exercise Price 
shall equal $200.
          "Expansion Factor" shall have the meaning set 
forth in Section 2.4(a) hereof.
          "Expiration Time" shall mean the earliest of 
(i) the Exchange Time, (ii) the Redemption Time and 
(iii) the close of business on the tenth anniversary of the 
Record Time.
          "Flip-in Date" shall mean the tenth business day 
after any Stock Acquisition Date or such earlier or later 
date as the Board of Directors of the Company may from time 
to time fix by resolution adopted prior to the Flip-in Date 
that would otherwise have occurred.
          "Flip-over Entity," for purposes of Section 3.2, 
shall mean (i) in the case of a Flip-over Transaction or 
Event described in clause (i) of the definition thereof, the 
Person issuing any securities into which shares of Common 
Stock are being converted or exchanged and, if no such 
securities are being issued, the other party to such 
Flip-over Transaction or Event and (ii) in the case of a 
Flip-over Transaction or Event referred to in clause (ii) or 
(iii) of the definition thereof, the Person receiving the 

                            -8-
<PAGE>

greatest portion of the (A) assets or (B) operating income 
or cash flow being transferred in such Flip-over Transaction 
or Event, provided in all cases if such Person is a 
subsidiary of a corporation, the parent corporation shall be 
the Flip-Over Entity.
          "Flip-over Stock" shall mean the capital stock (or 
similar equity interest) with the greatest voting power in 
respect of the election of directors (or other persons 
similarly responsible for direction of the business and 
affairs) of the Flip-Over Entity.
          "Flip-over Transaction or Event" shall mean a trans-
action or series of transactions after a Flip-in Date in which, 
directly or indirectly, (i) the Company shall consolidate or 
merge or participate in a share exchange with any other 
Person if, at the time of the consolidation, merger or share 
exchange or at the time the Company enters into any agree-
ment with respect to any such consolidation, merger or share 
exchange, the Acquiring Person Controls the Board of 
Directors of the Company and either (A) any term of or 
arrangement concerning the treatment of shares of capital 
stock in such consolidation, merger or share exchange 
relating to the Acquiring Person is not identical to the 
terms and arrangements relating to other holders of the 

                            -9-
<PAGE>

Common Stock or (B) the Person with whom the transaction or 
series of transactions occurs is the Acquiring Person or an 
Affiliate or Associate of the Acquiring Person, (ii) the 
Company shall sell or otherwise transfer (or one or more of 
its Subsidiaries shall sell or otherwise transfer) assets 
(A) aggregating more than 50% of the assets (measured by 
either book value or fair market value) or (B) generating 
more than 50% of the operating income or cash flow, of the 
Company and its Subsidiaries (taken as a whole) to any 
Person (other than the Company or one or more of its wholly 
owned Subsidiaries) or to two or more such Persons which are 
Affiliates or Associates or otherwise acting in concert, if, 
at the time of the entry by the Company (or any such 
Subsidiary) into an agreement with respect to such sale or 
transfer of assets, the Acquiring Person Controls the Board 
of Directors of the Company, or (iii) any Acquiring Person 
shall (A) sell, purchase, lease, exchange, mortgage, pledge, 
transfer or otherwise acquire or dispose of, to, from, or 
with, as the case may be, the Company or any of its 
Subsidiaries, over any period of 12 consecutive calendar 
months, assets (x) having an aggregate fair market value of 
more than $15,000,000 or (y) on terms and conditions less 
favorable to the Company than the Company would be able to 

                            -10-
<PAGE>

obtain through arm's-length negotiations with an 
unaffiliated third party, (B) receive any compensation for 
services from the Company or any of its Subsidiaries, other 
than compensation for full-time employment as a regular 
employee at rates in accordance with the Company's (or its 
Subsidiaries') past practices, (C) receive the benefit, 
directly or indirectly (except proportionately as a 
shareholder), over any period of 12 consecutive calendar 
months, of any loans, advances, guarantees, pledges, 
insurance, reinsurance or other financial assistance or any 
tax credits or other tax advantage provided by the Company 
or any of its Subsidiaries involving an aggregate principal 
amount in excess of $5,000,000 or an aggregate cost or 
transfer of benefits from the Company or any of its 
Subsidiaries in excess of $5,000,000 or, in any case, on 
terms and conditions less favorable to the Company than the 
Company would be able to obtain through arm's-length 
negotiations with a third party, or (D) increase by more 
than 1% its proportionate share of the outstanding shares of 
any class of equity securities or securities convertible 
into any class of equity securities of the Company or any of 
its Subsidiaries as a result of any acquisition from the 
Company (with or without consideration), any reclassifica-

                            -11-
<PAGE>

tion of securities (including any reverse stock split), or 
recapitalization, of the Company, any merger or consol-
idation of the Company or any other transaction or series of 
transactions (whether or not with or into or otherwise 
involving an Acquiring Person).  For purposes of the 
foregoing description, the term "Acquiring Person" shall 
include any Acquiring Person and its Affiliates and 
Associates, counted together as a single Person.  An 
Acquiring Person shall be deemed to Control the Company's 
Board of Directors when, following a Flip-in Date, the 
persons who were directors of the Company (or persons 
nominated and/or appointed as directors by vote of a 
majority of such persons) before the Stock Acquisition Date 
shall cease to constitute a majority of the Company's Board 
of Directors.
          "Market Price" per share of any securities on any 
date shall mean the average of the daily closing prices per 
share of such securities (determined as described below) on 
each of the 20 consecutive Trading Days through and 
including the Trading Day immediately preceding such date; 
provided, however, that if an event of a type analogous to 
- -------- --------
any of the events described in Section 2.4 hereof shall have 
caused the closing prices used to determine the Market Price 
   
                            -12-
<PAGE>

on any Trading Days during such period of 20 Trading Days 
not to be fully comparable with the closing price on such 
date, each such closing price so used shall be appropriately 
adjusted in order to make it fully comparable with the 
closing price on such date.  The closing price per share of 
any securities on any date shall be the last reported sale 
price, regular way, or, in case no such sale takes place or 
is quoted on such date, the average of the closing bid and 
asked prices, regular way, for each share of such 
securities, in either case as reported in the principal 
consolidated transaction reporting system with respect to 
securities listed or admitted to trading on the New York 
Stock Exchange, Inc. or, if the securities are not listed or 
admitted to trading on the New York Stock Exchange, Inc., as 
reported in the principal consolidated transaction reporting 
system with respect to securities listed on the principal 
national securities exchange on which the securities are 
listed or admitted to trading or, if the securities are not 
listed or admitted to trading on any national securities 
exchange, as reported by the National Association of Securi-
ties Dealers, Inc. Automated Quotation System or such other 
system then in use, or, if on any such date the securities 
are not listed or admitted to trading on any national 

                            -13-
<PAGE>

securities exchange or quoted by any such organization, the 
average of the closing bid and asked prices as furnished by 
a professional market maker making a market in the secu-
rities selected by the Board of Directors of the Company; 
provided, however, that if on any such date the securities 
- --------  -------
are not listed or admitted to trading on a national secu-
rities exchange or traded in the over-the-counter market, 
the closing price per share of such securities on such date 
shall mean the fair value per share of securities on such 
date as determined in good faith by the Board of Directors 
of the Company, after consultation with a nationally recog-
nized investment banking firm, and set forth in a certifi-
cate delivered to the Rights Agent. 
          "Option Holder" shall have the meaning set forth 
in the definition of Acquiring Person.
          "Payment Time" shall have the meaning set forth in 
the Recitals.
          "Person" shall mean any individual, firm, partner-
ship, association, group (as such term is used in Rule 13d-5 
under the Securities Exchange Act of 1934, as such Rule is 
in effect on the date of this Agreement), corporation or 
other entity.

                            -14-
<PAGE>

          "Preferred Stock" shall mean the series of Junior 
Participating Preferred Stock, par value $0.01 per share, of 
the Company created by a Statement of Resolution 
Establishing a Series of Shares in substantially the form 
set forth in Exhibit B hereto appropriately completed.
          "Record Time" shall have the meaning set forth in 
the Recitals.
          "Redemption Price" shall mean an amount equal to 
one cent, $0.01.
          "Redemption Time" shall mean the time at which the 
right to exercise the Rights shall terminate pursuant to 
Section 5.1 hereof.
          "Right" shall have the meaning set forth in the 
Recitals.
          "Rights Agent" shall have the meaning set forth in 
the Preamble.
          "Rights Certificate" shall have the meaning set 
forth in Section 2.3(c) hereof.
          "Rights Register" shall have the meaning set forth 
in Section 2.7(a) hereof.
          "Separation Time" shall mean the close of business 
on the earlier of (i) the tenth business day (or such later 
date as the Board of Directors of the Company may from time 

                            -15-
<PAGE>

to time fix by resolution adopted prior to the Separation 
Time that would otherwise have occurred) after the date on 
which any Person commences a tender or exchange offer which, 
if consummated, would result in such Person's becoming an 
Acquiring Person and (ii) the Flip-in Date; provided, that 
if the foregoing results in the Separation Time being prior 
to the Payment Time, the Separation Time shall be the 
Payment Time and provided further, that if any tender or 
                 -------- -------        
exchange offer referred to in clause (i) of this paragraph 
is cancelled, terminated or otherwise withdrawn prior to the 
Separation Time without the purchase of any shares of Common 
Stock pursuant thereto, such offer shall be deemed, for 
purposes of this paragraph, never to have been made.
          "Stock Acquisition Date" shall mean the first date 
of public announcement by the Company (by any means) that a 
Person has become an Acquiring Person.
          "Subsidiary" of any specified Person shall mean 
any corporation or other entity of which a majority of the 
voting power of the equity securities or a majority of the 
equity interest is Beneficially Owned, directly or 
indirectly, by such Person.
          "Trading Day," when used with respect to any 
securities, shall mean a day on which the New York Stock 

                            -16-
<PAGE>

Exchange, Inc. is open for the transaction of business or, 
if such securities are not listed or admitted to trading on 
the New York Stock Exchange, Inc., a day on which the 
principal national securities exchange on which such secur-
ities are listed or admitted to trading is open for the 
transaction of business or, if such securities are not 
listed or admitted to trading on any national securities 
exchange, a Business Day.

                         ARTICLE II                      
                         THE RIGHTS
          2.1 	Summary of Rights.  As soon as practicable 
               ----------------- 
after the Record Time, the Company will mail a letter 
summarizing the terms of the Rights to each holder of record 
of Common Stock as of the Record Time, at such holder's 
address as shown by the records of the Company.
          2.2  Legend on Common Stock Certificates.  
               ----------------------------------- 
Certificates for the Common Stock issued after the Record 
Time but prior to the Separation Time shall evidence one 
Right for each share of Common Stock represented thereby and 
shall have impressed on, printed on, written on or otherwise 
affixed to them the following legend:
     Until the Separation Time (as defined in the Rights 
     Agreement referred to below), this certificate also 
     evidences and entitles the holder hereof to certain 

                            -17- 
<PAGE>

     Rights as set forth in a Rights Agreement, dated as of 
     January 26, 1999 (as such may be amended from time to 
     time, the "Rights Agreement"), between Cullen/Frost 
     Bankers, Inc. (the "Company") and The Frost National 
     Bank, as Rights Agent, the terms of which are hereby 
     incorporated herein by reference and a copy of which is 
     on file at the principal executive offices of the 
     Company.  Under certain circumstances, as set forth in 
     the Rights Agreement, such Rights may be redeemed, may 
     become exercisable for securities or assets of the 
     Company or securities of another entity, may be 
     exchanged for shares of Common Stock or other 
     securities or assets of the Company, may expire, may 
     become void (if they are "Beneficially Owned" by an 
     "Acquiring Person" or an Affiliate or Associate 
     thereof, as such terms are defined in the Rights 
     Agreement, or by any transferee of any of the fore-
     going) or may be evidenced by separate certificates and 
     may no longer be evidenced by this certificate.  The 
     Company will mail or arrange for the mailing of a copy 
     of the Rights Agreement to the holder of this certif-
     icate without charge after the receipt of a written 
     request therefor.

Certificates representing shares of Common Stock that are 
issued and outstanding at the Payment Time shall evidence 
one Right for each share of Common Stock evidenced thereby 
notwithstanding the absence of the foregoing legend.
           2.3 	Exercise of Rights; Separation of Rights.  
                ----------------------------------------    
(a)  Subject to Sections 3.1, 5.1 and 5.10 and subject to 
adjustment as herein set forth, following the earlier of the 
expiration or redemption of the rights outstanding under the 
Company's Amended and Restated Shareholder Protection Rights 
Agreement dated as of July 30, 1996 each Right will entitle 
the holder thereof, after the Separation Time and prior to 

                            -18-
<PAGE>

the Expiration Time, to purchase, for the Exercise Price, 
one one-hundredth of a share of Preferred Stock.
          (b)  Until the Separation Time, (i) no Right may 
be exercised and (ii) each Right will be evidenced by the 
certificate for the associated share of Common Stock 
(together, in the case of certificates issued prior to the 
Payment Time, with the letter mailed to the record holder 
thereof pursuant to Section 2.1) and will be transferable 
only together with, and will be transferred by a transfer 
(whether with or without such letter) of, such associated 
share.  
          (c) 	Subject to the terms and conditions hereof, 
after the Separation Time and prior to the Expiration Time, 
the Rights (i) may be exercised and (ii) may be transferred 
independent of shares of Common Stock.  Promptly following 
the Separation Time, the Rights Agent will mail to each 
holder of record of Common Stock as of the Separation Time 
(other than any Person whose Rights have become void 
pursuant to Section 3.1(b)), at such holder's address as 
shown by the records of the Company (the Company hereby 
agreeing to furnish copies of such records to the Rights 
Agent for this purpose), (x) a certificate (a "Rights Cer-
tificate") in substantially the form of Exhibit A hereto 

                            -19-
<PAGE>

appropriately completed, representing the number of Rights 
held by such holder at the Separation Time and having such 
marks of identification or designation and such legends, 
summaries or endorsements printed thereon as the Company may 
deem appropriate and as are not inconsistent with the 
provisions of this Agreement, or as may be required to 
comply with any law or with any rule or regulation made 
pursuant thereto or with any rule or regulation of any 
national securities exchange or quotation system on which 
the Rights may from time to time be listed or traded, or to 
conform to usage, and (y) a disclosure statement describing 
the Rights.
           (d)	Subject to the terms and conditions hereof, 
Rights may be exercised on any Business Day after the 
Separation Time and prior to the Expiration Time by 
submitting to the Rights Agent the Rights Certificate 
evidencing such Rights with an Election to Exercise (an 
"Election to Exercise") substantially in the form attached 
to the Rights Certificate duly completed, accompanied by 
payment in cash, or by certified or official bank check or 
money order payable to the order of the Company, of a sum 
equal to the Exercise Price multiplied by the number of 
Rights being exercised and a sum sufficient to cover any 

                             -20-
<PAGE>

transfer tax or charge which may be payable in respect of 
any transfer involved in the transfer or delivery of Rights 
Certificates or the issuance or delivery of certificates for 
shares or depositary receipts (or both) in a name other than 
that of the holder of the Rights being exercised.
           (e) 	Upon receipt of a Rights Certificate, with an 
Election to Exercise accompanied by payment as set forth in 
Section 2.3(d), and subject to the terms and conditions 
hereof, the Rights Agent will thereupon promptly (i)(A) 
requisition from a transfer agent stock certificates 
evidencing such number of shares or other securities to be 
purchased (the Company hereby irrevocably authorizing its 
transfer agents to comply with all such requisitions) and 
(B) if the Company elects pursuant to Section 5.5 not to 
issue certificates representing fractional shares, 
requisition from the depositary selected by the Company 
depositary receipts representing the fractional shares to be 
purchased or requisition from the Company the amount of cash 
to be paid in lieu of fractional shares in accordance with 
Section 5.5 and (ii) after receipt of such certificates, 
depositary receipts and/or cash, deliver the same to or upon 
the order of the registered holder of such Rights 
Certificate, registered (in the case of certificates or 

                            -21-
<PAGE>

depositary receipts) in such name or names as may be desig-
nated by such holder.
          (f) 	In case the holder of any Rights shall 
exercise less than all the Rights evidenced by such holder's 
Rights Certificate, a new Rights Certificate evidencing the 
Rights remaining unexercised will be issued by the Rights 
Agent to such holder or to such holder's duly authorized 
assigns.
          (g) 	The Company covenants and agrees that it will 
(i) take all such action as may be necessary to ensure that 
all shares delivered upon exercise of Rights shall, at the 
time of delivery of the certificates for such shares (sub-
ject to payment of the Exercise Price), be duly and validly 
authorized, executed, issued and delivered and fully paid 
and nonassessable; (ii) take all such action as may be 
necessary to comply with any applicable requirements of the 
Securities Act of 1933 or the Exchange Act, and the rules 
and regulations thereunder, and any other applicable law, 
rule or regulation, in connection with the issuance of any 
shares upon exercise of Rights; and (iii) pay when due and 
payable any and all federal and state transfer taxes and 
charges which may be payable in respect of the original 
issuance or delivery of the Rights Certificates or of any 

                            -22-
<PAGE>

shares issued upon the exercise of Rights, provided, that 
the Company shall not be required to pay any transfer tax or 
charge which may be payable in respect of any transfer 
involved in the transfer or delivery of Rights Certificates 
or the issuance or delivery of certificates for shares in a 
name other than that of the holder of the Rights being 
transferred or exercised.
          2.4 	Adjustments to Exercise Price; Number of 
               ----------------------------------------
Rights.  (a)  In the event the Company shall at any time 
- ------
after the Record Time and prior to the Separation Time 
(i) declare or pay a dividend on Common Stock payable in 
Common Stock, (ii) subdivide the outstanding Common Stock or 
(iii) combine the outstanding Common Stock into a smaller 
number of shares of Common Stock, (x) the Exercise Price in 
effect after such adjustment will be equal to the Exercise 
Price in effect immediately prior to such adjustment divided 
by the number of shares of Common Stock (the "Expansion 
Factor") that a holder of one share of Common Stock immedi-
ately prior to such dividend, subdivision or combination 
would hold thereafter as a result thereof and (y) each Right 
held prior to such adjustment will become that number of 
Rights equal to the Expansion Factor, and the adjusted 
number of Rights will be deemed to be distributed among the 

                            -23-
<PAGE>

shares of Common Stock with respect to which the original 
Rights were associated (if they remain outstanding) and the 
shares issued in respect of such dividend, subdivision or 
combination, so that each such share of Common Stock will 
have exactly one Right associated with it.  Each adjustment 
made pursuant to this paragraph shall be made as of the 
payment or effective date for the applicable dividend, 
subdivision or combination.
          In the event the Company shall at any time after 
the Record Time and prior to the Separation Time issue any 
shares of Common Stock otherwise than in a transaction 
referred to in the preceding paragraph, each such share of 
Common Stock so issued shall automatically have one new 
Right associated with it, which Right shall be evidenced by 
the certificate representing such share.  To the extent 
provided in Section 5.3, Rights shall be issued by the 
Company in respect of shares of Common Stock that are issued 
or sold by the Company after the Separation Time.
          (b)  In the event the Company shall at any time 
after the Record Time and prior to the Separation Time issue 
or distribute any securities or assets in respect of, in 
lieu of or in exchange for Common Stock (other than pursuant 
to a regular periodic cash dividend or a dividend paid 

                            -24-
<PAGE>

solely in Common Stock) whether by dividend, in a 
reclassification or recapitalization (including any such 
transaction involving a merger, consolidation or share 
exchange), or otherwise, the Company shall make such 
adjustments, if any, in the Exercise Price, number of Rights 
and/or securities or other property purchasable upon exer-
cise of Rights as the Board of Directors of the Company, in 
its sole discretion, may deem to be appropriate under the 
circumstances in order to adequately protect the interests 
of the holders of Rights generally, and the Company and the 
Rights Agent shall amend this Agreement as necessary to 
provide for such adjustments.
          (c)  Each adjustment to the Exercise Price made 
pursuant to this Section 2.4 shall be calculated to the 
nearest cent.  Whenever an adjustment to the Exercise Price 
is made pursuant to this Section 2.4, the Company shall 
(i) promptly prepare a certificate setting forth such 
adjustment and a brief statement of the facts accounting for 
such adjustment and (ii) promptly file with the Rights Agent 
and with each transfer agent for the Common Stock a copy of 
such certificate.
          (d)	Rights certificates shall represent the 
securities purchasable under the terms of this Agreement, 

                            -25- 
<PAGE>

including any adjustment or change in the securities 
purchasable upon exercise of the Rights, even though such 
certificates may continue to express the securities 
purchasable at the time of issuance of the initial Rights 
Certificates.
          2.5 	Date on Which Exercise is Effective.  Each 
               ----------------------------------- 
person in whose name any certificate for shares is issued 
upon the exercise of Rights shall for all purposes be deemed 
to have become the holder of record of the shares 
represented thereby on the date upon which the Rights 
Certificate evidencing such Rights was duly surrendered and 
payment of the Exercise Price for such Rights (and any 
applicable taxes and other governmental charges payable by 
the exercising holder hereunder) was made; provided,
                                           -------- 
however, that if the date of such surrender and payment is a 
- -------
date upon which the stock transfer books of the Company are 
closed, such person shall be deemed to have become the 
record holder of such shares on, and such certificate shall 
be dated, the next succeeding Business Day on which the 
stock transfer books of the Company are open.  
          2.6 	Execution, Authentication, Delivery and 
               --------------------------------------- 
Dating of Rights Certificates.  (a)  The Rights Certificates 
- -----------------------------
shall be executed on behalf of the Company by its Senior 

                           -26-
<PAGE>

Chairman of the Board, Chairman of the Board, President or 
one of its Vice Presidents, under its corporate seal 
reproduced thereon attested by its Secretary or one of its 
Assistant Secretaries.  The signature of any of these 
officers on the Rights Certificates may be manual or facsim-
ile.
          Rights Certificates bearing the manual or fac-
simile signatures of individuals who were at any time the 
proper officers of the Company shall bind the Company, 
notwithstanding that such individuals or any of them have 
ceased to hold such offices prior to the countersignature 
and delivery of such Rights Certificates.
          Promptly after the Separation Time, the Company 
will notify the Rights Agent of such Separation Time and 
will deliver Rights Certificates executed by the Company to 
the Rights Agent for counter-signature, and, subject to 
Section 3.1(b), the Rights Agent shall manually countersign 
and deliver such Rights Certificates to the holders of the 
Rights pursuant to Section 2.3(c) hereof.  No Rights Certif-
icate shall be valid for any purpose unless manually 
countersigned by the Rights Agent.
          (b) 	Each Rights Certificate shall be dated the 
date of countersignature thereof.

                             -27- 
<PAGE>

          2.7 	Registration, Registration of Transfer and 
               ------------------------------------------  
Exchange.  (a)  After the Separation Time, the Company will 
- --------
cause to be kept a register (the "Rights Register") in 
which, subject to such reasonable regulations as it may 
prescribe, the Company will provide for the registration and 
transfer of Rights.  The Rights Agent is hereby appointed 
"Rights Registrar" for the purpose of maintaining the Rights 
Register for the Company and registering Rights and trans-
fers of Rights after the Separation Time as herein provided. 
In the event that the Rights Agent shall cease to be the 
Rights Registrar, the Rights Agent will have the right to 
examine the Rights Register at all reasonable times after 
the Separation Time.
          After the Separation Time and prior to the Expira-
tion Time, upon surrender for registration of transfer or 
exchange of any Rights Certificate, and subject to the 
provisions of Section 2.7(c) and (d), the Company will exe-
cute, and the Rights Agent will countersign and deliver, in 
the name of the holder or the designated transferee or 
transferees, as required pursuant to the holder's instruc-
tions, one or more new Rights Certificates evidencing the 
same aggregate number of Rights as did the Rights Certifi-
cate so surrendered.

                           -28-  
<PAGE>

          (b) 	Except as otherwise provided in Section 
3.1(b), all Rights issued upon any registration of transfer 
or exchange of Rights Certificates shall be the valid 
obligations of the Company, and such Rights shall be 
entitled to the same benefits under this Agreement as the 
Rights surrendered upon such registration of transfer or 
exchange.
          (c) 	Every Rights Certificate surrendered for 
registration of transfer or exchange shall be duly endorsed, 
or be accompanied by a written instrument of transfer in 
form satisfactory to the Company or the Rights Agent, as the 
case may be, duly executed by the holder thereof or such 
holder's attorney duly authorized in writing.  As a condi-
tion to the issuance of any new Rights Certificate under 
this Section 2.7, the Company may require the payment of a 
sum sufficient to cover any tax or other governmental charge 
that may be imposed in relation thereto.
          (d) 	The Company shall not be required to register 
the transfer or exchange of any Rights after such Rights 
have become void under Section 3.1(b), been exchanged under 
Section 3.1(c) or been redeemed under Section 5.1.
          2.8 	Mutilated, Destroyed, Lost and Stolen Rights 
               --------------------------------------------    
Certificates.  (a)  If any mutilated Rights Certificate is 
- ------------
                            -29-   
<PAGE>

surrendered to the Rights Agent prior to the Expiration 
Time, then, subject to Sections 3.1(b), 3.1(c) and 5.1, the 
Company shall execute and the Rights Agent shall countersign 
and deliver in exchange therefor a new Rights Certificate 
evidencing the same number of Rights as did the Rights 
Certificate so surrendered.
          (b) 	If there shall be delivered to the Company 
and the Rights Agent prior to the Expiration Time (i) evi-
dence to their satisfaction of the destruction, loss or 
theft of any Rights Certificate and (ii) such security or 
indemnity as may be required by them to save each of them 
and any of their agents harmless, then, subject to Sections 
3.1(b), 3.1(c) and 5.1 and in the absence of notice to the 
Company or the Rights Agent that such Rights Certificate has 
been acquired by a bona fide purchaser, the Company shall 
execute and upon its request the Rights Agent shall 
countersign and deliver, in lieu of any such destroyed, lost 
or stolen Rights Certificate, a new Rights Certificate 
evidencing the same number of Rights as did the Rights 
Certificate so destroyed, lost or stolen.
          (c) 	As a condition to the issuance of any new 
Rights Certificate under this Section 2.8, the Company may 
require the payment of a sum sufficient to cover any tax or 

                            -30-
<PAGE>

other governmental charge that may be imposed in relation 
thereto and any other expenses (including the fees and 
expenses of the Rights Agent) connected therewith.
          (d) 	Every new Rights Certificate issued pursuant 
to this Section 2.8 in lieu of any destroyed, lost or stolen 
Rights Certificate shall evidence an original additional 
contractual obligation of the Company, whether or not the 
destroyed, lost or stolen Rights Certificate shall be at any 
time enforceable by anyone, and, subject to Section 3.1(b) 
shall be entitled to all the benefits of this Agreement 
equally and proportionately with any and all other Rights 
duly issued hereunder.
          2.9  Persons Deemed Owners.  Prior to due present-
               ---------------------   
ment of a Rights Certificate (or, prior to the Separation 
Time, the associated Common Stock certificate) for registra-
tion of transfer, the Company, the Rights Agent and any 
agent of the Company or the Rights Agent may deem and treat 
the person in whose name such Rights Certificate (or, prior 
to the Separation Time, such Common Stock certificate) is 
registered as the absolute owner thereof and of the Rights 
evidenced thereby for all purposes whatsoever, including the 
payment of the Redemption Price and neither the Company nor 
the Rights Agent shall be affected by any notice to the 

                            -31-
<PAGE>

contrary.  As used in this Agreement, unless the context 
otherwise requires, the term "holder" of any Rights shall 
mean the registered holder of such Rights (or, prior to the 
Separation Time, the associated shares of Common Stock).
          2.10  Delivery and Cancellation of Certificates.  
                -----------------------------------------
All Rights Certificates surrendered upon exercise or for 
registration of transfer or exchange shall, if surrendered 
to any person other than the Rights Agent, be delivered to 
the Rights Agent and, in any case, shall be promptly can-
celled by the Rights Agent.  The Company may at any time 
deliver to the Rights Agent for cancellation any Rights 
Certificates previously countersigned and delivered 
hereunder which the Company may have acquired in any manner 
whatsoever, and all Rights Certificates so delivered shall 
be promptly cancelled by the Rights Agent.  No Rights 
Certificates shall be countersigned in lieu of or in 
exchange for any Rights Certificates cancelled as provided 
in this Section 2.10, except as expressly permitted by this 
Agreement.  The Rights Agent shall destroy all cancelled 
Rights Certificates and deliver a certificate of destruction 
to the Company.
          2.11  Agreement of Rights Holders.  Every holder 
                ---------------------------
of Rights by accepting the same consents and agrees with the 

                            -32-
<PAGE>

Company and the Rights Agent and with every other holder of 
Rights that:
          (a)	prior to the Separation Time, each Right will 
be transferable only together with, and will be transferred 
by a transfer of, the associated share of Common Stock;
          (b)	after the Separation Time, the Rights Cer-
tificates will be transferable only on the Rights Register 
as provided herein; 
          (c)	prior to due presentment of a Rights Certifi-
cate (or, prior to the Separation Time, the associated 
Common Stock certificate) for registration of transfer, the 
Company, the Rights Agent and any agent of the Company or 
the Rights Agent may deem and treat the person in whose name 
the Rights Certificate (or, prior to the Separation Time, 
the associated Common Stock certificate) is registered as 
the absolute owner thereof and of the Rights evidenced 
thereby for all purposes whatsoever, and neither the Company 
nor the Rights Agent shall be affected by any notice to the 
contrary;
          (d)	Rights beneficially owned by certain Persons 
will, under the circumstances set forth in Section 3.1(b), 
become void; and

                            -33-
<PAGE>


          (e)  this Agreement may be supplemented or amended 
from time to time pursuant to Section 2.4(b) or 5.4 hereof.
                        
                         ARTICLE III

               	ADJUSTMENTS TO THE RIGHTS IN 
             	THE EVENT OF CERTAIN TRANSACTIONS

          3.1  Flip-in.  (a)  In the event that prior to the 
               -------
Expiration Time a Flip-in Date shall occur, then, to the 
extent applicable law permits Rights owned by certain 
Persons referred to in Section 3.1(b) to become void 
pursuant to the provisions thereof, except as provided in 
this Section 3.1, each Right shall constitute the right to 
purchase from the Company, upon exercise thereof in 
accordance with the terms hereof (but subject to 
Section 5.10), that number of shares of Common Stock having 
an aggregate Market Price on the Stock Acquisition Date 
equal to twice the Exercise Price for an amount in cash 
equal to the Exercise Price (such right to be appropriately 
adjusted in order to protect the interests of the holders of 
Rights generally in the event that on or after such Stock 
Acquisition Date an event of a type analogous to any of the 
events described in Section 2.4(a) or (b) shall have 
occurred with respect to the Common Stock).
          (b)  Notwithstanding the foregoing, to the extent 
permitted by applicable law, any Rights that are or were 

                            -34-
<PAGE>

Beneficially Owned on or after the Stock Acquisition Date by 
an Acquiring Person or an Affiliate or Associate thereof or 
by any transferee, direct or indirect, of any of the forego-
ing shall become void and any holder of such Rights (includ-
ing transferees) shall thereafter have no right to exercise 
or transfer such Rights under any provision of this Agree-
ment.  If any Rights Certificate is presented for assignment 
or exercise and the Person presenting the same will not 
complete the certification set forth at the end of the form 
of assignment or notice of election to exercise and provide 
such additional evidence of the identity of the Beneficial 
Owner and its Affiliates and Associates (or former Benefi-
cial Owners and their Affiliates and Associates) as the 
Company shall reasonably request, then the Company shall be 
entitled conclusively to deem the Beneficial Owner thereof 
to be an Acquiring Person or an Affiliate or Associate 
thereof or a transferee of any of the foregoing and accord-
ingly will, to the extent permitted by applicable law, deem 
the Rights evidenced thereby to be void and not transferable 
or exercisable.
          (c)	The Board of Directors of the Company may, at 
its option, at any time after a Flip-in Date and prior to 
the time that an Acquiring Person becomes the Beneficial 

                           -35-
<PAGE>

Owner of more than 50% of the outstanding shares of Common 
Stock, but only to the extent applicable law permits Rights 
owned by certain Persons referred to in Section 3.1(b) to 
become void pursuant to the provisions thereof, elect to 
exchange all (but not less than all) the then outstanding 
Rights (which shall not include Rights that have become void 
pursuant to the provisions of Section 3.1(b)) for shares of 
Common Stock at an exchange ratio of one share of Common 
Stock per Right, appropriately adjusted in order to protect 
the interests of holders of Rights generally in the event 
that after the Separation Time an event of a type analogous 
to any of the events described in Section 2.4(a) or (b) 
shall have occurred with respect to the Common Stock (such 
exchange ratio, as adjusted from time to time, being here-
inafter referred to as the "Exchange Ratio").
          Immediately upon the action of the Board of 
Directors of the Company electing to exchange the Rights, 
without any further action and without any notice, the right 
to exercise the Rights will terminate and each Right (other 
than Rights that have become void pursuant to Section 
3.1(b)) will thereafter represent only the right to receive 
a number of shares of Common Stock equal to the Exchange 
Ratio.  Promptly after the action of the Board of Directors 

                           -36-
<PAGE>

electing to exchange the Rights, the Company shall give 
notice thereof (specifying the steps to be taken to receive 
shares of Common Stock in exchange for Rights) to the Rights 
Agent and the holders of the Rights (other than Rights that 
have become void pursuant to Section 3.1(b)) outstanding 
immediately prior thereto by mailing such notice in 
accordance with Section 5.9.
          Each Person in whose name any certificate for 
shares is issued upon the exchange of Rights pursuant to 
this Section 3.1(c) or Section 3.1(d) shall for all purposes 
be deemed to have become the holder of record of the shares 
represented thereby on, and such certificate shall be dated, 
the date upon which the Rights Certificate evidencing such 
Rights was duly surrendered and payment of any applicable 
taxes and other governmental charges payable by the holder 
was made; provided, however, that if the date of such 
          --------  -------
surrender and payment is a date upon which the stock 
transfer books of the Company are closed, such Person shall 
be deemed to have become the record holder of such shares 
on, and such certificate shall be dated, the next succeeding 
Business Day on which the stock transfer books of the 
Company are open.

                           -37-
<PAGE>

          (d)  Whenever the Company shall become obligated 
under Section 3.1(a) or (c) to issue shares of Common Stock 
upon exercise of or in exchange for Rights, the Company, at 
its option, may substitute therefor shares of Preferred 
Stock, at a ratio of one one-hundredth of a share of Pre-
ferred Stock for each share of Common Stock so issuable.
          (e)  In the event that there shall not be suffi-
cient treasury shares or authorized but unissued shares of 
Common Stock or Preferred Stock of the Company to permit the 
exercise or exchange in full of the Rights in accordance 
with Section 3.1(a) or (c), and the Company elects not to, 
or is otherwise unable to, make the exchange referred to in 
Section 3.1(c), the Company shall either (i) call a meeting 
of shareholders seeking approval to cause sufficient 
additional shares to be authorized (provided that if such 
approval is not obtained the Company will take the action 
specified in clause (ii) of this sentence) or (ii) take such 
action as shall be necessary to ensure and provide, to the 
extent permitted by applicable law and any agreements or 
instruments in effect on the Stock Acquisition Date to which 
it is a party, that each Right shall thereafter constitute 
the right to receive, (x) at the Company's option, either  
(A) in return for the Exercise Price, debt or equity 

                           -38-
<PAGE>

securities or other assets (or a combination thereof) having 
a fair value equal to twice the Exercise Price, or 
(B) without payment of consideration (except as otherwise 
required by applicable law), debt or equity securities or 
other assets (or a combination thereof) having a fair value 
equal to the Exercise Price, or (y) if the Board of 
Directors of the Company elects to exchange the Rights in 
accordance with Section 3.1(c), debt or equity securities or 
other assets (or a combination thereof) having a fair value 
equal to the product of the Market Price of a share of 
Common Stock on the Flip-in Date times the Exchange Ratio in 
effect on the Flip-in Date, where in any case set forth in 
(x) or (y) above the fair value of such debt or equity 
securities or other assets shall be as determined in good 
faith by the Board of Directors of the Company, after 
consultation with a nationally recognized investment banking 
firm.  
          3.2  Flip-over.  (a)  Prior to the Expiration
               ---------        
Time, the Company shall not enter into any agreement with 
respect to, consummate or permit to occur any Flip-over 
Transaction or Event unless and until it shall have entered 
into a supplemental agreement with the Flip-over Entity, for 
the benefit of the holders of the Rights, providing that, 

                             -39-
<PAGE>

upon consummation or occurrence of the Flip-over Transaction 
or Event (i) each Right shall thereafter constitute the 
right to purchase from the Flip-over Entity, upon exercise 
thereof in accordance with the terms hereof, that number of 
shares of Flip-over Stock of the Flip-over Entity having an 
aggregate Market Price on the date of consummation or 
occurrence of such Flip-over Transaction or Event equal to 
twice the Exercise Price for an amount in cash equal to the 
Exercise Price (such right to be appropriately adjusted in 
order to protect the interests of the holders of Rights 
generally in the event that after such date of consummation 
or occurrence an event of a type analogous to any of the 
events described in Section 2.4(a) or (b) shall have 
occurred with respect to the Flip-over Stock) and (ii) the 
Flip-over Entity shall thereafter be liable for, and shall 
assume, by virtue of such Flip-over Transaction or Event and 
such supplemental agreement, all the obligations and duties 
of the Company pursuant to this Agreement.  The provisions 
of this Section 3.2 shall apply to successive Flip-over 
Transactions or Events.
          (b)  Prior to the Expiration Time, unless the 
Rights will be redeemed pursuant to  Section 5.1 hereof in 
connection therewith, the Company shall not enter into any 

                            -40-
<PAGE>

agreement with respect to, consummate or permit to occur any 
Flip-over Transaction or Event if at the time thereof there 
are any rights, warrants or securities outstanding or any 
other arrangements, agreements or instruments that would 
eliminate or otherwise diminish in any material respect the 
benefits intended to be afforded by this Rights Agreement to 
the holders of Rights upon consummation of such transaction.
        
                        	ARTICLE IV

                     	THE RIGHTS AGENT
           4.1 	General.  (a)  The Company hereby appoints 
                -------
the Rights Agent to act as agent for the Company in accor-
dance with the terms and conditions hereof, and the Rights 
Agent hereby accepts such appointment.  The Company agrees 
to pay to the Rights Agent reasonable compensation for all 
services rendered by it hereunder and, from time to time, on 
demand of the Rights Agent, its reasonable expenses and 
counsel fees and other disbursements incurred in the admin-
istration and execution of this Agreement and the exercise 
and performance of its duties hereunder.  The Company also 
agrees to indemnify the Rights Agent for, and to hold it 
harmless against, any loss, liability, or expense, incurred 
without negligence, bad faith or willful misconduct on the 
part of the Rights Agent, for anything done or omitted to be 

                           -41-  
<PAGE>

done by the Rights Agent in connection with the acceptance 
and administration of this Agreement, including the costs 
and expenses of defending against any claim of liability.
          (b) 	The Rights Agent shall be protected and shall 
incur no liability for or in respect of any action taken, 
suffered or omitted by it in connection with its adminis-
tration of this Agreement in reliance upon any certificate 
for securities purchasable upon exercise of Rights, Rights 
Certificate, certificate for other securities of the 
Company, instrument of assignment or transfer, power of 
attorney, endorsement, affidavit, letter, notice, direction, 
consent, certificate, statement, or other paper or document 
believed by it to be genuine and to be signed, executed and, 
where necessary, verified or acknowledged, by the proper 
person or persons.
          4.2	 Merger or Consolidation or Change of Name of 
               -------------------------------------------- 
Rights Agent.  (a)  Any corporation into which the Rights 
- ------------
Agent or any successor Rights Agent may be merged or with 
which it may be consolidated, or any corporation resulting 
from any merger or consolidation to which the Rights Agent 
or any successor Rights Agent is a party, or any corporation 
succeeding to the shareholder services business of the 
Rights Agent or any successor Rights Agent, will be the 

                             -42-
<PAGE>

successor to the Rights Agent under this Agreement without 
the execution or filing of any paper or any further act on 
the part of any of the parties hereto, provided that such 
corporation would be eligible for appointment as a successor 
Rights Agent under the provisions of Section 4.4 hereof.  In 
case at the time such successor Rights Agent succeeds to the 
agency created by this Agreement any of the Rights Certifi-
cates have been countersigned but not delivered, any such 
successor Rights Agent may adopt the countersignature of the 
predecessor Rights Agent and deliver such Rights 
Certificates so countersigned; and in case at that time any 
of the Rights Certificates have not been countersigned, any 
successor Rights Agent may countersign such Rights 
Certificates either in the name of the predecessor Rights 
Agent or in the name of the successor Rights Agent; and in 
all such cases such Rights Certificates will have the full 
force provided in the Rights Certificates and in this 
Agreement.
          (b)	In case at any time the name of the Rights 
Agent is changed and at such time any of the Rights Certifi-
cates shall have been countersigned but not delivered, the 
Rights Agent may adopt the countersignature under its prior 
name and deliver Rights Certificates so countersigned; and 

                            -43-
<PAGE>

in case at that time any of the Rights Certificates shall 
not have been countersigned, the Rights Agent may 
countersign such Rights Certificates either in its prior 
name or in its changed name; and in all such cases such 
Rights Certificates shall have the full force provided in 
the Rights Certificates and in this Agreement.
          4.3 Duties of Rights Agent.  The Rights Agent
              ----------------------
undertakes the duties and obligations imposed by this Agree-
ment upon the following terms and conditions, by all of 
which the Company and the holders of Rights Certificates, by 
their acceptance thereof, shall be bound:
          (a)	 The Rights Agent may consult with legal 
counsel (who may be legal counsel for the Company), and the 
opinion of such counsel will be full and complete 
authorization and protection to the Rights Agent as to any 
action taken or omitted by it in good faith and in 
accordance with such opinion.
          (b) 	Whenever in the performance of its duties 
under this Agreement the Rights Agent deems it necessary or 
desirable that any fact or matter be proved or established 
by the Company prior to taking or suffering any action here-
under, such fact or matter (unless other evidence in respect 
thereof be herein specifically prescribed) may be deemed to 

                           -44-
<PAGE>


be conclusively proved and established by a certificate 
signed by a person believed by the Rights Agent to be the 
Senior Chairman of the Board, Chairman of the Board, the 
President or any Vice President, the Chief Financial 
Officer, Treasurer or any Assistant Treasurer or the 
Secretary or any Assistant Secretary of the Company and 
delivered to the Rights Agent; and such certificate will be 
full authorization to the Rights Agent for any action taken 
or suffered in good faith by it under the provisions of this 
Agreement in reliance upon such certificate.
          (c)	The Rights Agent will be liable hereunder 
only for its own negligence, bad faith or willful 
misconduct.
          (d)	The Rights Agent will not be liable for or by 
reason of any of the statements of fact or recitals 
contained in this Agreement or in the certificates for 
securities purchasable upon exercise of Rights or the Rights 
Certificates (except its countersignature thereof) or be 
required to verify the same, but all such statements and 
recitals are and will be deemed to have been made by the 
Company only.
          (e)	The Rights Agent will not be under any 
responsibility in respect of the validity of this Agreement 

                            -45-
<PAGE>

or the execution and delivery hereof (except the due author-
ization, execution and delivery hereof by the Rights Agent) 
or in respect of the validity or execution of any certifi-
cate for securities purchasable upon exercise of Rights or 
Rights Certificate (except its countersignature thereof); 
nor will it be responsible for any breach by the Company of 
any covenant or condition contained in this Agreement or in 
any Rights Certificate; nor will it be responsible for any 
change in the exercisability of the Rights (including the 
Rights becoming void pursuant to Section 3.1(b) hereof) or 
any adjustment required under the provisions of Section 2.4, 
3.1 or 3.2 hereof or responsible for the manner, method or 
amount of any such adjustment or the ascertaining of the 
existence of facts that would require any such adjustment 
(except with respect to the exercise of Rights after receipt 
of the certificate contemplated by Section 2.4 describing 
any such adjustment); nor will it by any act hereunder be 
deemed to make any representation or warranty as to the 
authorization or reservation of any securities purchasable 
upon exercise of Rights or any Rights or as to whether any 
securities purchasable upon exercise of Rights will, when 
issued, be duly and validly authorized, executed, issued and 
delivered and fully paid and nonassessable.

                            -46-   
<PAGE>

          (f)	The Company agrees that it will perform, 
execute, acknowledge and deliver or cause to be performed, 
executed, acknowledged and delivered all such further and 
other acts, instruments and assurances as may reasonably be 
required by the Rights Agent for the carrying out or per-
forming by the Rights Agent of the provisions of this 
Agreement.
          (g)	The Rights Agent is hereby authorized and 
directed to accept instructions with respect to the per-
formance of its duties hereunder from any person believed by 
the Rights Agent to be the Senior Chairman of the Board, 
Chairman of the Board, the President or any Vice President 
or the Secretary or any Assistant Secretary or the Chief 
Financial Officer, Treasurer or any Assistant Treasurer of 
the Company, and to apply to such persons for advice or 
instructions in connection with its duties, and it shall not 
be liable for any action taken or suffered by it in good 
faith in accordance with instructions of any such person.
          (h)	The Rights Agent and any Shareholder, direc-
tor, officer or employee of the Rights Agent may buy, sell 
or deal in Common Stock, Rights or other securities of the 
Company or become pecuniarily interested in any transaction 
in which the Company may be interested, or contract with or 

                           -47- 
<PAGE>

lend money to the Company or otherwise act as fully and 
freely as though it were not Rights Agent under this Agree-
ment.  Nothing herein shall preclude the Rights Agent from 
acting in any other capacity for the Company or for any 
other legal entity.
          (i)	The Rights Agent may execute and exercise any 
of the rights or powers hereby vested in it or perform any 
duty hereunder either itself or by or through its attorneys 
or agents, and the Rights Agent will not be answerable or 
accountable for any act, default, neglect or misconduct of 
any such attorneys or agents or for any loss to the Company 
resulting from any such act, default, neglect or misconduct, 
provided reasonable care was exercised in the selection and 
continued employment thereof.
          4.4  Change of Rights Agent.  The Rights Agent may
               ----------------------   
resign and be discharged from its duties under this Agree-
ment upon 90 days' notice (or such lesser notice as is 
acceptable to the Company) in writing mailed to the Company 
and to each transfer agent of Common Stock by registered or 
certified mail, and to the holders of the Rights in accor-
dance with Section 5.9.  The Company may remove the Rights 
Agent upon 30 days' notice in writing, mailed to the Rights 
Agent and to each transfer agent of the Common Stock by 

                           -48-
<PAGE>

registered or certified mail, and to the holders of the 
Rights in accordance with Section 5.9.  If the Rights Agent 
should resign or be removed or otherwise become incapable of 
acting, the Company will appoint a successor to the Rights 
Agent.  If the Company fails to make such appointment within 
a period of 30 days after such removal or after it has been 
notified in writing of such resignation or incapacity by the 
resigning or incapacitated Rights Agent or by the holder of 
any Rights (which holder shall, with such notice, submit 
such holder's Rights Certificate for inspection by the 
Company), then the holder of any Rights may apply to any 
court of competent jurisdiction for the appointment of a new 
Rights Agent.  Any successor Rights Agent, whether appointed 
by the Company or by such a court, shall be a corporation 
organized and doing business under the laws of the United 
States or any state of the United States, in good standing, 
which is authorized under such laws to exercise the powers 
of the Rights Agent contemplated by this Agreement and is 
subject to supervision or examination by federal or state 
authority and which has at the time of its appointment as 
Rights Agent a combined capital and surplus of at least 
$50,000,000.  After appointment, the successor Rights Agent 
will be vested with the same powers, rights, duties and 

                            -49-
<PAGE>

responsibilities as if it had been originally named as 
Rights Agent without further act or deed; but the predeces-
sor Rights Agent shall deliver and transfer to the successor 
Rights Agent any property at the time held by it hereunder, 
and execute and deliver any further assurance, conveyance, 
act or deed necessary for the purpose.  Not later than the 
effective date of any such appointment, the Company will 
file notice thereof in writing with the predecessor Rights 
Agent and each transfer agent of the Common Stock, and mail 
a notice thereof in writing to the holders of the Rights.  
Failure to give any notice provided for in this Section 4.4, 
however, or any defect therein, shall not affect the 
legality or validity of the resignation or removal of the 
Rights Agent or the appointment of the successor Rights 
Agent, as the case may be.

                          ARTICLE V 

                         MISCELLANEOUS

          5.1  Redemption. (a)  The Board of Directors of
               ----------   
the Company may, at its option, at any time prior to the 
close of business on the Flip-in Date, elect to redeem all 
(but not less than all) the then outstanding Rights at the 
Redemption Price and the Company, at its option, may pay the 
Redemption Price either in cash or shares of Common Stock or 

                           -50-
<PAGE>

other securities of the Company deemed by the Board of 
Directors, in the exercise of its sole discretion, to be at 
least equivalent in value to the Redemption Price.
          (b)  Immediately upon the action of the Board of 
Directors of the Company electing to redeem the Rights (or, 
if the resolution of the Board of Directors electing to 
redeem the Rights states that the redemption will not be 
effective until the occurrence of a specified future time or 
event, upon the occurrence of such future time or event), 
without any further action and without any notice, the right 
to exercise the Rights will terminate and each Right will 
thereafter represent only the right to receive the 
Redemption Price in cash or securities, as determined by the 
Board of Directors.  Promptly after the Rights are redeemed, 
the Company shall give notice of such redemption to the 
Rights Agent and the holders of the then outstanding Rights 
by mailing such notice in accordance with Section 5.9.
          5.2  Expiration.  The Rights and this Agreement
               ----------  
shall expire at the Expiration Time and no Person shall have 
any rights pursuant to this Agreement or any Right after the 
Expiration Time, except, if the Rights are exchanged or 
redeemed, as provided in Section 3.1 or 5.1 hereof, 
respectively.

                            -51-
<PAGE>

          5.3  Issuance of New Rights Certificates.  Not-
               -----------------------------------
withstanding any of the provisions of this Agreement or of 
the Rights to the contrary, the Company may, at its option, 
issue new Rights Certificates evidencing Rights in such form 
as may be approved by its Board of Directors to reflect any 
adjustment or change in the number or kind or class of 
shares of stock purchasable upon exercise of Rights made in 
accordance with the provisions of this Agreement.  In 
addition, in connection with the issuance or sale of shares 
of Common Stock by the Company following the Separation Time 
and prior to the Expiration Time pursuant to the terms of 
securities convertible or redeemable into shares of Common 
Stock or to options, in each case issued or granted prior 
to, and outstanding at, the Separation Time, the Company 
shall issue to the holders of such shares of Common Stock, 
Rights Certificates representing the appropriate number of 
Rights in connection with the issuance or sale of such 
shares of Common Stock; provided, however, in each case, (i) 
                        --------  -------
no such Rights Certificate shall be issued, if, and to the 
extent that, the Company shall be advised by counsel that 
such issuance would create a significant risk of material 
adverse tax consequences to the Company or to the Person to 
whom such Rights Certificates would be issued, (ii) no such 

                            -52-
<PAGE>

Rights Certificates shall be issued if, and to the extent 
that, appropriate adjustment shall have otherwise been made 
in lieu of the issuance thereof, and (iii) the Company shall 
have no obligation to distribute Rights Certificates to any 
Acquiring Person or Affiliate or Associate of an Acquiring 
Person or any transferee of any of the foregoing.
          5.4  Supplements and Amendments.  The Company and
               --------------------------
the Rights Agent may from time to time supplement or amend 
this Agreement without the approval of any holders of Rights 
(i) prior to the close of business on the Flip-in Date, in 
any respect and (ii) after the close of business on the 
Flip-in Date, to make any changes that the Company may deem 
necessary or desirable and which shall not materially 
adversely affect the interests of the holders of Rights 
generally or in order to cure any ambiguity or to correct or 
supplement any provision contained herein which may be 
inconsistent with any other provisions herein or otherwise 
defective.  The Rights Agent will duly execute and deliver 
any supplement or amendment hereto requested by the Company 
which satisfies the terms of the preceding sentence.
          5.5  Fractional Shares.  If the Company elects not 
               -----------------
to issue certificates representing fractional shares upon 
exercise or redemption of Rights, the Company shall, in lieu 

                            -53-
<PAGE>

thereof, in the sole discretion of the Board of Directors, 
either (a) evidence such fractional shares by depositary 
receipts issued pursuant to an appropriate agreement between 
the Company and a depositary selected by it, providing that 
each holder of a depositary receipt shall have all of the 
rights, privileges and preferences to which such holder 
would be entitled as a beneficial owner of such fractional 
share, or (b) pay to the registered holder of such Rights 
the appropriate fraction of the Market Price per share in 
cash.
          5.6  Rights of Action.  Subject to the terms of
               ----------------
this Agreement (including Sections 3.1(b) and 5.14), rights 
of action in respect of this Agreement, other than rights of 
action vested solely in the Rights Agent, are vested in the 
respective holders of the Rights; and any holder of any 
Rights, without the consent of the Rights Agent or of the 
holder of any other Rights, may, on such holder's own behalf 
and for such holder's own benefit and the benefit of other 
holders of Rights, enforce, and may institute and maintain 
any suit, action or proceeding against the Company to 
enforce, or otherwise act in respect of, such holder's right 
to exercise such holder's Rights in the manner provided in 
such holder's Rights Certificate and in this Agreement.  

                            -54-
<PAGE>

Without limiting the foregoing or any remedies available to 
the holders of Rights, it is specifically acknowledged that 
the holders of Rights would not have an adequate remedy at 
law for any breach of this Agreement and will be entitled to 
specific performance of the obligations under, and 
injunctive relief against actual or threatened violations 
of, the obligations of any Person subject to this Agreement.
          5.7  Holder of Rights Not Deemed a Shareholder.
               -----------------------------------------   
No holder, as such, of any Rights shall be entitled to vote, 
receive dividends or be deemed for any purpose the holder of 
shares or any other securities which may at any time be 
issuable on the exercise of such Rights, nor shall anything 
contained herein or in any Rights Certificate be construed 
to confer upon the holder of any Rights, as such, any of the 
rights of a shareholder of the Company or any right to vote 
for the election of directors or upon any matter submitted 
to shareholders at any meeting thereof, or to give or 
withhold consent to any corporate action, or to receive 
notice of meetings or other actions affecting shareholders 
(except as provided in Section 5.8 hereof), or to receive 
dividends or subscription rights, or otherwise, until such 
Rights shall have been exercised or exchanged in accordance 
with the provisions hereof.

                            -55-
<PAGE>
  
          5.8  Notice of Proposed Actions.  In case the
               --------------------------
Company shall propose after the Separation Time and prior to 
the Expiration Time (i) to effect or permit a Flip-over 
Transaction or Event or (ii) to effect the liquidation, 
dissolution or winding up of the Company, then, in each such 
case, the Company shall give to each holder of a Right, in 
accordance with Section 5.9 hereof, a notice of such 
proposed action, which shall specify the date on which such 
Flip-over Transaction or Event, liquidation, dissolution, or 
winding up is to take place, and such notice shall be so 
given at least 20 Business Days prior to the date of the 
taking of such proposed action.  
          5.9  Notices.  Notices or demands authorized or
               -------
required by this Agreement to be given or made by the Rights 
Agent or by the holder of any Rights to or on the Company 
shall be sufficiently given or made if delivered or sent by 
first-class mail, postage prepaid, addressed (until another 
address is filed in writing with the Rights Agent) as 
follows:
               Cullen/Frost Bankers, Inc.
               P.O. Box 1600
               100 West Houston Street
               San Antonio, Texas 78296

               Attention: Chief Financial Officer

                            -56-
<PAGE>


Any notice or demand authorized or required by this Agree-
ment to be given or made by the Company or by the holder of 
any Rights to or on the Rights Agent shall be sufficiently 
given or made if delivered or sent by first-class mail, 
postage prepaid, addressed (until another address is filed 
in writing with the Company) as follows:
               The Frost National Bank
               100 West Houston Street
               4th Floor
               San Antonio, Texas 78205

Notices or demands authorized or required by this Agreement 
to be given or made by the Company or the Rights Agent to or 
on the holder of any Rights shall be sufficiently given or 
made if delivered or sent by first-class mail, postage 
prepaid, addressed to such holder at the address of such 
holder as it appears upon the registry books of the Rights 
Agent or, prior to the Separation Time, on the registry 
books of the transfer agent for the Common Stock.  Any 
notice which is mailed in the manner herein provided shall 
be deemed given, whether or not the holder receives the 
notice.
          5.10  Suspension of Exercisability.  To the extent 
                ----------------------------
that the Company determines in good faith that some action 
will or need be taken pursuant to Section 3.1 or to comply 
with federal or state securities laws, the Company may 

                            -57-
<PAGE>

suspend the exercisability of the Rights for a reasonable 
period in order to take such action or comply with such 
laws.  In the event of any such suspension, the Company 
shall issue as promptly as practicable a public announcement 
stating that the exercisability or exchangeability of the 
Rights has been temporarily suspended.  Notice thereof 
pursuant to Section 5.9 shall not be required.
          Failure to give a notice pursuant to the provi-
sions of this Agreement shall not affect the validity of any 
action taken hereunder.
          5.11  Costs of Enforcement.  The Company agrees 
                --------------------
that if the Company or any other Person the securities of 
which are purchasable upon exercise of Rights fails to 
fulfill any of its obligations pursuant to this Agreement, 
then the Company or such Person will reimburse the holder of 
any Rights for the costs and expenses (including legal fees) 
incurred by such holder in actions to enforce such holder's 
rights pursuant to any Rights or this Agreement.
          5.12  Successors.  All the covenants and provi-
                ----------   
sions of this Agreement by or for the benefit of the Company 
or the Rights Agent shall bind and inure to the benefit of 
their respective successors and assigns hereunder.

                            -58-
<PAGE>

          5.13  Benefits of this Agreement.  Nothing in this 
                --------------------------
Agreement shall be construed to give to any Person other 
than the Company, the Rights Agent and the holders of the 
Rights any legal or equitable right, remedy or claim under 
this Agreement and this Agreement shall be for the sole and 
exclusive benefit of the Company, the Rights Agent and the 
holders of the Rights.
          5.14	Determination and Actions by the Board of 
               ----------------------------------------- 
Directors, etc.  The Board of Directors of the Company shall 
- ---------------
have the exclusive power and authority to administer this 
Agreement and to exercise all rights and powers specifically 
granted to the Board or to the Company, or as may be 
necessary or advisable in the administration of this 
Agreement, including, without limitation, the right and 
power to (i) interpret the provisions of this Agreement and 
(ii) make all determinations deemed necessary or advisable 
for the administration of this Agreement.  All such actions, 
calculations, interpretations and determinations (including, 
for purposes of clause (y) below, all omissions with respect 
to the foregoing) which are done or made by the Board in 
good faith, shall (x) be final, conclusive and binding on 
the Company, the Rights Agent, the holders of the Rights and 
all other parties, and (y) not subject the Board of 

                           -59-
<PAGE>

Directors of the Company to any liability to the holders of 
the Rights.
          5.15  Descriptive Headings.  Descriptive headings 
                --------------------
appear herein for convenience only and shall not control or 
affect the meaning or construction of any of the provisions 
hereof.
          5.16  Governing Law.  THIS AGREEMENT AND EACH 
                -------------
RIGHT ISSUED HEREUNDER SHALL BE DEEMED TO BE A CONTRACT MADE 
UNDER THE LAWS OF THE STATE OF TEXAS AND FOR ALL PURPOSES 
SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE 
LAWS OF SUCH STATE APPLICABLE TO CONTRACTS TO BE MADE AND 
PERFORMED ENTIRELY WITHIN SUCH STATE.
          5.17  Counterparts.  This Agreement may be 
                ------------  
executed in any number of counterparts and each of such 
counterparts shall for all purposes be deemed to be an 
original, and all such counterparts shall together 
constitute but one and the same instrument.
          5.18  Severability.  If any term or provision 
                ------------ 
hereof or the application thereof to any circumstance shall, 
in any jurisdiction and to any extent, be invalid or unen-
forceable, such term or provision shall be ineffective as to 
such jurisdiction to the extent of such invalidity or unen-
forceability without invalidating or rendering unenforceable 

                           -60-
<PAGE>

the remaining terms and provisions hereof or the application 
of such term or provision to circumstances other than those 
as to which it is held invalid or unenforceable.

                            -61-
<PAGE>


          IN WITNESS WHEREOF, the parties hereto have caused 
this Agreement to be duly executed as of the date first 
above written.
                              CULLEN/FROST BANKERS, INC.



                              By: /s/Richard W. Evans, Jr.   
                                 ----------------------------
                                 Name:  Richard W. Evans, Jr.
                                 Title: Chairman/CEO


                              THE FROST NATIONAL BANK



                              By: /s/ Phillip D. Green        
                                 -----------------------------			
                                 Name: Phillip D. Green
                                Title: Senior Executive Vice President
                                       & Chief Financial Officer

 
                             -62-




 
EXHIBIT 2



    Forms of Rights Certificate and of Election to Exercise, included in
                     Exhibit A to the Rights Agreement.

<PAGE>

                   

                                                 	EXHIBIT A

                	[Form of Rights Certificate]

Certificate No. W-                     ------- Rights

     THE RIGHTS ARE SUBJECT TO REDEMPTION OR 
     MANDATORY EXCHANGE, AT THE OPTION OF THE 
     COMPANY, ON THE TERMS SET FORTH IN THE RIGHTS 
     AGREEMENT.  TO THE EXTENT PERMITTED BY 
     APPLICABLE LAW RIGHTS BENEFICIALLY OWNED BY 
     ACQUIRING PERSONS OR AFFILIATES OR ASSOCIATES 
     THEREOF (AS SUCH TERMS ARE DEFINED IN THE 
     RIGHTS AGREEMENT) OR TRANSFEREES OF ANY OF 
     THE FOREGOING WILL BE VOID.

	                    Rights Certificate


	                CULLEN/FROST BANKERS, INC.

          This certifies that ____________________, or reg-
istered assigns, is the registered holder of the number of 
Rights set forth above, each of which entitles the regis-
tered holder thereof, subject to the terms, provisions and 
conditions of the Shareholder Protection Rights Agreement, 
dated as of January 26, 1999 (as amended from time to time, 
the "Rights Agreement"), between Cullen/Frost Bankers, Inc., 
a Texas corporation (the "Company"), and The Frost National 
Bank, as Rights Agent (the "Rights Agent", which term shall 
include any successor Rights Agent under the Rights 
Agreement), to purchase from the Company at any time after 
the Separation Time (as such term is defined in the Rights 
Agreement) and prior to the close of business on February 8, 
2009, one one-hundredth of a fully paid share of Junior 

<PAGE>

Participating Preferred Stock, par value $0.01 per share 
(the "Preferred Stock"), of the Company (subject to 
adjustment as provided in the Rights Agreement) at the 
Exercise Price referred to below, upon presentation and 
surrender of this Rights Certificate with the Form of Elec-
tion to Exercise duly executed at the principal office of 
the Rights Agent in San Antonio, Texas.  The Exercise Price 
shall initially be $200 per Right and shall be subject to 
adjustment in certain events as provided in the Rights 
Agreement.  
          In certain circumstances described in the Rights 
Agreement, the Rights evidenced hereby may entitle the reg-
istered holder thereof to purchase securities of an entity 
other than the Company or securities of the Company other 
than Preferred Stock or assets of the Company, all as 
provided in the Rights Agreement.
          This Rights Certificate is subject to all of the 
terms, provisions and conditions of the Rights Agreement, 
which terms, provisions and conditions are hereby incorpo-
rated herein by reference and made a part hereof and to 
which Rights Agreement reference is hereby made for a full 
description of the rights, limitations of rights, obliga-
tions, duties and immunities hereunder of the Rights Agent, 

                            -2-
<PAGE>

the Company and the holders of the Rights Certificates.  
Copies of the Rights Agreement are on file at the principal 
office of the Company and are available without cost upon 
written request.
          This Rights Certificate, with or without other 
Rights Certificates, upon surrender at the office of the 
Rights Agent designated for such purpose, may be exchanged 
for another Rights Certificate or Rights Certificates of 
like tenor evidencing an aggregate number of Rights equal to 
the aggregate number of Rights evidenced by the Rights 
Certificate or Rights Certificates surrendered.  If this 
Rights Certificate shall be exercised in part, the reg-
istered holder shall be entitled to receive, upon surrender 
hereof, another Rights Certificate or Rights Certificates 
for the number of whole Rights not exercised.
          Subject to the provisions of the Rights Agreement, 
each Right evidenced by this Certificate may be (a) redeemed 
by the Company under certain circumstances, at its option, 
at a redemption price of $0.01 per Right or (b) exchanged by 
the Company under certain circumstances, at its option, for 
one share of Common Stock or one one-hundredth of a share of 
Preferred Stock per Right (or, in certain cases, other 
securities or assets of the Company), subject in each case 

                           -3-
<PAGE>

to adjustment in certain events as provided in the Rights 
Agreement.
          No holder of this Rights Certificate, as such, 
shall be entitled to vote or receive dividends or be deemed 
for any purpose the holder of any securities which may at 
any time be issuable on the exercise hereof, nor shall 
anything contained in the Rights Agreement or herein be 
construed to confer upon the holder hereof, as such, any of 
the rights of a shareholder of the Company or any right to 
vote for the election of directors or upon any matter 
submitted to shareholders at any meeting thereof, or to give 
or withhold consent to any corporate action, or to receive 
notice of meetings or other actions affecting shareholders 
(except as provided in the Rights Agreement), or to receive 
dividends or subscription rights, or otherwise, until the 
Rights evidenced by this Rights Certificate shall have been 
exercised or exchanged as provided in the Rights Agreement.

                          -4-  
<PAGE>

          This Rights Certificate shall not be valid or 
obligatory for any purpose until it shall have been counter-
signed by the Rights Agent.
          WITNESS the facsimile signature of the proper 
officers of the Company and its corporate seal.

Date:  ____________


ATTEST:                      CULLEN/FROST BANKERS, INC.



- -------------------          By--------------------------   
  Secretary


Countersigned:

THE FROST NATIONAL BANK


By                         
  -----------------------
   Authorized Signature 

                               
                                  -5-
<PAGE>


                  	[Form of Reverse Side of Rights Certificate]

                       	FORM OF ASSIGNMENT

       	(To be executed by the registered holder if such
     	holder desires to transfer this Rights Certificate.)

           FOR VALUE RECEIVED ________________________ hereby

sells, assigns and transfers unto ___________________
                                  (Please print name 
_____________________________________________________
             and address of transferee)

this Rights Certificate, together with all right, title and 
interest therein, and does hereby irrevocably constitute and 
appoint _______________ Attorney, to transfer the within 
Rights Certificate on the books of the within-named Company, 
with full power of substitution.
Dated:  _______________, ____

Signature Guaranteed:               -------------------------
                                    Signature
                                    (Signature must correspond 
                                    to name as written upon the 
                                    face of this Rights 
                                    Certificate in every 
                                    particular, without 
                                    alteration or enlargement or 
                                    any change whatsoever)


          Signatures must be guaranteed by an eligible 
guarantor institution (banks, stockbrokers, savings and loan 
associations and credit unions with membership in an 
approved signature guarantee Medallion program), pursuant to 
SEC Rule 17Ad-15.

<PAGE>




- ------------------------------------------------------------
                  (To be completed if true)

The undersigned hereby represents, for the benefit of all 
holders of Rights and shares of Common Stock, that the 
Rights evidenced by this Rights Certificate are not, and, to 
the knowledge of the undersigned, have never been, Bene-
ficially Owned by an Acquiring Person or an Affiliate or 
Associate thereof (as defined in the Rights Agreement).


                                   _________________________
                                   Signature

- ------------------------------------------------------------


                          	NOTICE

          In the event the certification set forth above is 
not completed in connection with a purported assignment, the 
Company will deem the Beneficial Owner of the Rights 
evidenced by the enclosed Rights Certificate to be an 
Acquiring Person or an Affiliate or Associate thereof (as 
defined in the Rights Agreement) or a transferee of any of 
the foregoing and accordingly will deem the Rights evidenced 
by such Rights Certificate to be void and not transferable 
or exercisable.

                           -2-
<PAGE>

07 89-5P       	[To be attached to each Rights Certificate]

               	FORM OF ELECTION TO EXERCISE
               -----------------------------

           	(To be executed if holder desires to
             	exercise the Rights Certificate.)

TO: CULLEN/FROST BANKERS, INC.

          The undersigned hereby irrevocably elects to exer-
cise _______________________ whole Rights represented by the 
attached Rights Certificate to purchase the shares of 
Participating Preferred Stock issuable upon the exercise of 
such Rights and requests that certificates for such shares 
be issued in the name of:

          ___________________________________
          Address:                           
          -----------------------------------
          ___________________________________
          Social Security or Other Taxpayer
          Identification Number:             
          -----------------------------------


If such number of Rights shall not be all the Rights evi-
denced by this Rights Certificate, a new Rights Certificate 
for the balance of such Rights shall be registered in the 
name of and delivered to:
          ___________________________________
          Address:                           
          -----------------------------------
          ___________________________________
          Social Security or Other Taxpayer
          Identification Number:             
          -----------------------------------

Dated:  _______________, ____



Signature Guaranteed:               _________________________
                                    Signature
                                    (Signature must correspond 
                                    to name as written upon the 
                                    face of the 

<PAGE>

                                    attached Rights Certificate 
                                    in every particular, without 
                                    alteration or enlargement or 
                                    any change whatsoever)

          Signatures must be guaranteed by an eligible 
guarantor institution (banks, stockbrokers, savings and loan 
associations and credit unions with membership in an 
approved signature guarantee Medallion program), pursuant to 
SEC Rule 17Ad-15.


- ------------------------------------------------------------
                  (To be completed if true)

          The undersigned hereby represents, for the benefit 
of all holders of Rights and shares of Common Stock, that 
the Rights evidenced by the attached Rights Certificate are 
not, and, to the knowledge of the undersigned, have never 
been, Beneficially Owned by an Acquiring Person or an 
Affiliate or Associate thereof (as defined in the Rights 
Agreement).


                                   _________________________
                                   Signature

- ------------------------------------------------------------

                            NOTICE
                            ------

          In the event the certification set forth above is 
not completed in connection with a purported exercise, the 
Company will deem the Beneficial Owner of the Rights 
evidenced by the attached Rights Certificate to be an 
Acquiring Person or an Affiliate or Associate thereof (as 
defined in the Rights Agreement) or a transferee of any of 
the foregoing and accordingly will deem the Rights evidenced 
by such Rights Certificate to be void and not transferable 
or exercisable.




EXHIBIT 3

      Form of Statement of Resolution Establishing A Series of Junior
Participating Prefferred Stock, included in Exhibit B to the Rights Agreement

<PAGE>


                                                  	EXHIBIT B

                  	STATEMENT OF RESOLUTION
              	ESTABLISHING A SERIES OF SHARES
               -------------------------------

To the Secretary of State
  of the State of Texas:

          Pursuant to the provisions of Article 2.13 of the 
Texas Business Corporation Act, the undersigned submits the 
following statement for the purpose of establishing and 
designating a series of shares and fixing and determining 
the relative rights and preferences thereof:
          1.  The name of the corporation is Cullen/Frost 
Bankers, Inc., a Texas corporation (the "Corporation").
          2.  The following resolution, establishing and 
designating a series of shares and fixing and determining 
the relative rights and preferences thereof, was duly 
adopted by the Board of Directors of the Corporation on 
January 26, 1999:
          RESOLVED, that there is hereby established a 
     series of Junior Preferred Stock, par value $5.00 per 
     share, of the Corporation, and the designation and 
     certain powers, preferences and other rights of the 
     shares of such series, and certain qualifications, 
     limitations and restrictions thereon, are hereby fixed 
     as follows:

                 (i) The distinctive serial designation of
           this series shall be "Junior Participating 
           Preferred Stock" (hereinafter called "this 
           Series").  Each share of this Series shall be 
           identical in all respects with the other shares of 
           this Series except as to the dates from and after 
           which dividends thereon shall be cumulative.

               	 (ii)	The number of shares in this Series 
           shall initially be 250,000, which number may from 

<PAGE>

           time to time be increased or decreased (but not 
           below the number then outstanding) by the Board of 
           Directors.  Shares of this Series purchased by the 
           Corporation shall be cancelled and shall revert to 
           authorized but unissued shares of Preferred Stock 
           undesignated as to series.  Shares of this Series 
           may be issued in fractional shares, which 
           fractional shares shall, entitle the holder, in 
           proportion to such holder's fractional share, to 
           all rights of a holder of a whole share of this 
           Series.

               	(iii)	The holders of full or fractional 
           shares of this Series shall be entitled to 
           receive, when and as declared by the Board of 
           Directors, but only out of funds legally available 
           therefor, dividends, (A) on each date that 
           dividends or other distributions (other than 
           dividends or distributions payable in Common Stock 
           of the Corporation) are payable on or in respect 
           of Common Stock comprising part of the Reference 
           Package (as defined below), in an amount per whole 
           share of this Series equal to the aggregate amount 
           of dividends or other distributions (other than 
           dividends or distributions payable in Common Stock 
           of the Corporation) that would be payable on such 
           date to a holder of the Reference Package and 
           (B) on the last day of March, June, September and 
           December in each year, in an amount per whole 
           share of this Series equal to the excess (if any) 
           of $25.00 over the aggregate dividends paid per 
           whole share of this Series during the three month 
           period ending on such last day.  Each such 
           dividend shall be paid to the holders of record of 
           shares of this Series on the date, not exceeding 
           sixty days preceding such dividend or distribution 
           payment date, fixed for the purpose by the Board 
           of Directors in advance of payment of each 
           particular dividend or distribution.  Dividends on 
           each full and each fractional share of this Series 
           shall be cumulative from the date such full or 
           fractional share is originally issued; provided 
           that any such full or fractional share originally 
           issued after a dividend record date and on or 
           prior to the dividend payment date to which such 
           record date relates shall not be entitled to 
           receive the dividend payable on such dividend 
           payment date or any amount in respect of the 

                              -2-
<PAGE>

           period from such original issuance to such 
           dividend payment date.

                     The term "Reference Package" shall 
           initially mean 100 shares of Common Stock, par 
           value $0.01 per share ("Common Stock"), of the 
           Corporation.  In the event the Corporation shall 
           at any time after the close of business on 
           _____________, 19__* (A) declare or pay a dividend 
           on any Common Stock payable in Common Stock, 
           (B) subdivide any Common Stock or (C) combine any 
           Common Stock into a smaller number of shares, then 
           and in each such case the Reference Package after 
           such event shall be the Common Stock that a holder 
           of the Reference Package immediately prior to such 
           event would hold thereafter as a result thereof.

                     Holders of shares of this Series shall 
           not be entitled to any dividends, whether payable 
           in cash, property or stock, in excess of full 
           cumulative dividends, as herein provided on this 
           Series.

                     So long as any shares of this Series are 
           outstanding, no dividend (other than a dividend in 
           Common Stock or in any other stock ranking junior 
           to this Series as to dividends and upon 
           liquidation) shall be declared or paid or set 
           aside for payment or other distribution declared 
           or made upon the Common Stock or upon any other 
           stock ranking junior to this Series as to 
           dividends or upon liquidation, nor shall any 
           Common Stock nor any other stock of the 
           Corporation ranking junior to or on a parity with 
           this Series as to dividends or upon liquidation be 
           redeemed, purchased or otherwise acquired for any 
           consideration (or any moneys be paid to or made 
           available for a sinking fund for the redemption of 
           any shares of any such stock) by the Corporation 


- --------------------
*
     For a certificate of designation relating to shares to
     be issued pursuant to Section 2.3 of the Rights
     Agreement, insert the Separation Time.  For a
     certificate designation relating to shares to be issued
     pursuant to Section 3.1(d) of the Rights Agreement,
     insert the Flip-in Date.

                            -3-
<PAGE>

           (except by conversion into or exchange for stock 
           of the Corporation ranking junior to this Series 
           as to dividends and upon liquidation), unless, in 
           each case, the full cumulative dividends 
           (including the dividend to be due upon payment of 
           such dividend, distribution, redemption, purchase 
           or other acquisition) on all outstanding shares of 
           this Series shall have been, or shall 
           contemporaneously be, paid.

                	(iv)	In the event of any merger, 
           consolidation, reclassification or other 
           transaction in which the shares of Common Stock 
           are exchanged for or changed into other stock or 
           securities, cash and/or any other property, then 
           in any such case the shares of this Series shall 
           at the same time be similarly exchange or changed 
           in any amount per whole share equal to the 
           aggregate amount of stock, securities, cash and/or 
           any other property (payable in kind), as the case 
           may be, that a holder of the Reference Package 
           would be entitled to receive as a result of such 
           transaction.

	                 (v)	In the event of any liquidation, 
           dissolution or winding up of the affairs of the 
           Corporation, whether voluntary or involuntary, the 
           holders of full and fractional shares of this 
           Series shall be entitled, before any distribution 
           or payment is made on any date to the holder of 
           the Common Stock or any other stock of the 
           Corporation ranking junior to this Series upon 
           liquidation, to be paid in full an amount per 
           whole share of this Series equal to the greater of 
           (A) $____________* or (B) the aggregate amount 
           distributed or to be distributed prior to such 
           date in connection with such liquidation, 
           dissolution or winding up to a holder of the 
           Reference Package (such greater amount being 
           hereinafter referred to as the "Liquidation 
           Preference"), together with accrued dividends to 
           such distribution or payment date, whether or not 
           earned or declared.  If such payment shall have 
           been made in full to all holders of shares of this 

- ---------------------
*
     Insert an amount equal to 100 times the Exercise Price
     in effect as of the Separation Time.

                             -4-
<PAGE>

           Series, the holders of shares of this Series as 
           such shall have no right or claim to any of the 
           remaining assets of the Corporation.

                     This Series shall be subordinate to, and 
           shall be entitled to a distribution upon 
           liquidation after, all series of Preferred Stock 
           of the Corporation except for such Series as by 
           its terms ranks pari passu with, or subordinate 
           to, this Series.

                     In the event the assets of the 
           Corporation available for distribution to the 
           holders of shares of this Series upon any 
           liquidation, dissolution or winding up of the 
           Corporation, whether voluntary or involuntary, 
           shall be insufficient to pay in full all amounts 
           to which such holders are entitled pursuant to the 
           first paragraph of this Section (v), after giving 
           effect to the second paragraph of this 
           Section (v), no such distribution shall be made on 
           account of any shares of any other class or series 
           of Preferred Stock ranking on a parity with the 
           shares of this Series upon such liquidation, 
           dissolution or winding up unless proportionate 
           distributive amounts shall be paid on account of 
           the shares of this Series, ratably in proportion 
           to the full distributable amounts for which 
           holders of all such parity shares are respectively 
           entitled upon such liquidation, dissolution or 
           winding up.  

                     Upon the liquidation, dissolution or 
           winding up of the Corporation, the holders of 
           shares of this Series then outstanding shall be 
           entitled to be paid out of assets of the 
           Corporation available for distribution to its 
           stockholders all amounts to which such holders are 
           entitled pursuant to the first and second 
           paragraphs of this Section (v) before any payment 
           shall be made to the holders of Common Stock or 
           any other stock of the Corporation ranking junior 
           upon liquidation to this Series.

                     For the purpose of this Section (v), the 
           consolidation or merger of the Corporation with 
           any other corporation shall not be deemed to 
           constitute a liquidation, dissolution or winding 
           up of the Corporation.

                             -5-
<PAGE>

                    	(vi)	The shares of this Series shall not be 
           redeemable.

                   	(vii)	In addition to any other vote or 
           consent of shareholders required by law or by the 
           Restated Certificate of Incorporation, as amended, 
           of the Corporation, each whole share of this 
           Series shall, on any matter, vote as a class with 
           any other capital stock comprising part of the 
           Reference Package and voting on such matter and 
           shall have the number of votes thereon that a 
           holder of the Reference Package would have.

           IN WITNESS WHEREOF, the undersigned have signed 
and attested this certificate on the ______ day of 
____________, ____.

                              CULLEN/FROST BANKERS, INC.


 
                              By:_________________________
                                 Name:
                                 Title:



Attest:



_____________________________


                             -6-





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