SECURITIES AND EXCHANGE COMMISSION

Washington, D. C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934

(Amendment No. 26)

Cullen/Frost Bankers, Inc.

(Name of Issuer)

Common Stock, par value $0.01 per share

(Title of Class of Securities)

229899 10 9

(CUSIP Number)

Check the following box if a fee is being paid with this statement: /__/

CUSIP No. 229899 10 9

1)

Names of Reporting Persons S.S. or I.R.S.

Identification Nos. of Above Persons.

Cullen/Frost Bankers, Inc. ("Cullen/Frost Bankers")

74-1751768

2)

Check the Appropriate Box if a Member of a Group (See

Instructions).

(a) /__/

(b) /__/

3)

SEC USE ONLY

4)

Citizenship or Place of Organization. Incorporated

under the laws of the State of Texas

Number of Shares Beneficially Owned by Each Reporting Person

with:

5)

Sole Voting Power

265,592

6)

Shared Voting Power

3,136,829

**

7)

Sole Dispositive Power

198,154

8)

Shared Dispositive Power

82,968

9)

Aggregate Amount Beneficially Owned by Each Reporting

Person. 4,838,843*

10)

Check if the Aggregate Amount in Row (9) Excludes

Certain Shares (See Instructions)

11)

Percent of Class Represented by Amount in Row 9.

8.1%

12)

Type of Reporting Person (See Instructions). HC

* Includes 1,436,422 shares with respect to which subsidiaries of Cullen/Frost Bankers have no voting power and 4,557,721** shares with respect to which subsidiaries of Cullen/Frost Bankers have no dispositive power. Inasmuch as all shares are held by subsidiaries of Cullen/Frost Bankers in a fiduciary capacity, Cullen/Frost Bankers explicitly disclaims beneficial ownership of all such shares for purposes of Sections 13(d) and 13(g) of the Securities Exchange Act of 1934 ("1934 Act") pursuant to the provisions of Rule 13d-4 promulgated under the 1934 Act.

** Includes 3,136,829 shares held by participants of the 401(k) Plan.

CUSIP No. 229899 10 9

1)

Names of Reporting Persons S.S. or I.R.S. Identification

Nos. of Above Persons

The Frost National Bank ("Frost Bank") 74-0635455

2)

Check the Appropriate Box if a Member of a Group (See

Instructions)

(a) /__/

(b) /__/

3)

SEC USE ONLY

Citizenship or Place of Organization.

Incorporated under the laws of the United States

Number of Shares Beneficially Owned by Each Reporting Person

with:

5)

Sole Voting Power

265,592

6)

Shared Voting Power

3,136,829

**

7)

Sole Dispositive Power

198,154

8)

Shared Dispositive Power

82,968

9)

Aggregate Amount Beneficially Owned by Each Reporting

Person. 4,838,843*

10)

Check if the Aggregate Amount in Row (9) Excludes

Certain Shares (See Instructions)

11)

Percent of Class Represented by Amount in Row 9.

8.1%

12)

Type of Reporting Person (See Instructions). BK

* Includes 1,436,422 shares with respect to which Frost Bank has no voting power and 4,557,721** shares with respect to which Frost Bank has no dispositive power. Inasmuch as all shares are held by Frost Bank in a fiduciary capacity, Frost Bank explicitly disclaims beneficial ownership of all such shares for purposes of Sections 13(d) and 13(g) of the Securities Exchange Act of 1934 ("1934 Act") pursuant of the provisions of Rule 13d-4 promulgated under the 1934 Act.

** Includes 3,136,829 shares held by participants of the 401(k) Plan.

Item

1

(a)

Name of Issuer:

Cullen/Frost Bankers, Inc. ("Cullen/Frost Bankers")

Item

1

(b)

Address of Issuer's Principal Executive Offices:

100 West Houston Street

San Antonio, Texas 78205

Item

2

(a)

Name of Persons Filing:

Cullen/Frost Bankers and The Frost National Bank

("Frost Bank")

Item

2

(b)

Address or Principal Business Office or, if none,

Residence:

The address of Cullen/Frost Bankers and Frost Bank

is 100 W. Houston Street, San Antonio, Texas 78205

Item

2

(c)

Citizenship:

Cullen/Frost Bankers is incorporated under the laws

of the State of Texas; Frost Bank is incorporated

under the laws of the United States.

Item

2

(d)

Title of Class of Securities:

Common Stock, par value $0.01 per share

Item

2

(e)

CUSIP Number:

229899 10 9

Item

3

If this statement is filed pursuant to Rules 13d-

1(b), or 13d-2(b), check whether the person filing

is a:

(a)

[ ]

Broker or Dealer registered under section

15 of the Act

(b)

[x]

Bank as defined in section 3(a)(6) of the

Act (Note: See Items 2, 4, 6, and 7)

(Frost Bank)

(c)

[ ]

Insurance Company as defined in sections

3(a)(19) of the Act

(d)

[ ]

Investment Company registered under

sections 8 of the Investment Company Act

(e)

[ ]

Investment Adviser registered under

section 203 of the Investment Advisers

Act of 1940

(f)

[ ]

Employee Benefit Plan, Pensions Fund

which is subject to the provisions of

the Employee Retirement Income Security

Act of 1974 or Endowment Fund; see

s 240.13d-1(b)(1)(ii)(F)

(g)

[X]

Parent Holding Company, in accordance

with s 340.13d-1(b)(ii)(G) (Note: See

Items 2, 4, 5, and 7) (Cullen/Frost

Bankers)

(h)

[ ]

Group, in accordance with s 240.13d-

1(b)(1)(ii)(H)

Item

4

Ownership:

(a)

Amount Beneficially Owned:

At December 31, 2006, Cullen/Frost Bankers

was deemed to have owned beneficially

4,838,843 shares of Cullen/Frost Bankers

Common Stock, including -0- shares where

there was a right to acquire. Included among

such shares were shares which were

beneficially owned by Frost Bank, a wholly-

owned subsidiary of Cullen/Frost Bankers.

(b)

Percent of Class:

Cullen/Frost Bankers

8.1%

Frost Bank

8.1%

(c)

Number of shares as to which such person has:

(i)

sole power to vote or to direct the vote

Cullen/Frost Bankers

265,592 shares

Frost Bank

265,592

(ii)

Shared power to vote or to direct the

vote

Cullen/Frost Bankers

3,136,829** shares

Frost Bank

3,136,829**

(iii)

sole power to dispose or to direct the

disposition of

Cullen/Frost Bankers

198,154 shares

Frost Bank

198,154

(iv)

shared power to dispose or to direct

the disposition of

Cullen/Frost Bankers

82,968 shares

Frost Bank

82,968

These totals do not include a total of 1,436,422 shares with respect to which Cullen/Frost Bankers and Frost Bank have no voting power and 4,557,721** shares with respect to which Cullen/Frost Bankers and Frost Bank have no dispositive power. Inasmuch as all shares described are held by subsidiaries of Cullen/Frost Bankers in a fiduciary capacity, Cullen/Frost Bankers and Frost Bank specifically disclaim beneficial ownership of all such shares for purposes of Sections 13 (d) and 13 (g) of the Securities Exchange Act of 1934 ("1934 Act") pursuant to Rule 13d-4 promulgated under the 1934 Act.

Item

5

Ownership of Five Percent or Less of a Class.

Not Applicable.

Item

6

Ownership of More than Five Percent on Behalf of

Another Person.

At December 31, 2006, Frost Bank did not own securities of Cullen/Frost Bankers for their own account; but, said bank held of record in various fiduciary capacities an aggregate of 4,838,843 shares. The Bank has reported to Cullen/Frost Bankers that these securities, registered in the name of the reporting bank as fiduciary or in the names of various of their nominees, were owned by a separate instrument which sets forth the power of the reporting bank with regard to the securities held in such account. Virtually all of these accounts involved persons who have the right to receive or direct the receipt of dividends from, or the proceeds of the sale of, the securities reported in Item 4. The individual interest of each of said persons did not relate to more than five percent of the class.

** Includes 3,136,829 shares held by participants of the 401(k) Plan.

Item

7

Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company.

All of the securities being reported on are held of record by Frost Bank. Each of such entities is an Item 3(b) entity. See Items 4 and 6.

Item

8

Identification and Classification of Members of the Group.

Not Applicable.

Item

9

Notice of Dissolution of Group.

Not Applicable.

Item

10

Certification.

By signing below, I certify that, to the best of my knowledge and belief, the securities referred to above were acquired in the ordinary course of business and were not acquired for the purpose of and do not have the effect of changing or influencing the control of the issuer of such securities and were not acquired in connection with or as a participant in any transaction having such purposes or effect.

Signature

      After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

January 19, 2007

Date

CULLEN/FROST BANKERS, INC.

/s/ Stan McCormick

Signature

Stan McCormick, Secretary

Name/Title

THE FROST NATIONAL BANK

/s/ Richard Kardys

Signature

Richard Kardys, Group Executive Vice President

Name/Title

Exhibit A

AGREEMENT

      Cullen/Frost Bankers, Inc. and The Frost National Bank do each hereby agree that the Schedule 13G, to which this Agreement is attached as Exhibit A, shall be jointly filed by such entities.

      IN WITNESS WHEREOF, Cullen/Frost Bankers, Inc., acting by and through a duly authorized officer, and The Frost National Bank , acting by and through a duly authorized officer, have executed this Agreement, on the 19^th day of January, 2007.

CULLEN/FROST BANKERS, INC.

By /s/ Stan McCormick

Its Secretary

THE FROST NATIONAL BANK

By /s/ Richard Kardys

Its Group Executive Vice President