FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * TONELLI QUENTIN J   2. Issuer Name and Ticker or Trading Symbol IDEXX LABORATORIES INC /DE [IDXX] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Vice President (Last) (First) (Middle) C/O IDEXX LABORATORIES, INC., ONE IDEXX DRIVE 3. Date of Earliest Transaction (Month/Day/Year) 05/04/2005 (Street) WESTBROOK, ME 04092 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 05/04/2005   M   2,756 A $ 23.88 7,928 D   Common Stock 05/04/2005   S   2,756 D $ 57.8136 5,172 D   Common Stock 05/05/2005   M   5,254 A $ 22.6875 10,426 D   Common Stock 05/05/2005   S   5,254 D $ 57.7654 5,172 (1) D

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Non-Qualified Stock Option (right to buy)

$ 23.88

05/04/2005

M

2,756

(2)

10/18/2010

Common Stock

2,756

$ 23.88

0

D

Non-Qualified Stock Option (right to buy)

$ 22.6875

05/05/2005

M

5,254

(3)

02/07/2011

Common Stock

5,254

$ 22.6875

0

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
TONELLI QUENTIN J C/O IDEXX LABORATORIES, INC. ONE IDEXX DRIVE WESTBROOK, ME 04092			Vice President

Signatures

Conan R. Deady, Attorney-in-Fact for Quentin J. Tonelli, PhD		05/06/2005
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	Reporting person indirectly holds 4,646 shares of Common Stock of IDEXX Laboratories, Inc., which shares are held by the Andrew Q. Tonelli UTMA and Bret C. Tonelli UTMA. Reporting person disclaims beneficial ownership of these shares and this report should not be deemed an admission that the reporting person is the beneficial owner of such shares for purposes of Section 16 or any other purpose.
(2)	Grant of option to buy shares of Common Stock exercisable as to 2,000 shares on 10/18/01 and 10/18/02, 1,644 shares on 10/18/03 and 1,902 shares on 10/18/04.
(3)	Grant of option to buy shares of Common Stock exercisable as to 2,000 shares on 2/07/02, 1,999 shares on 2/07/03, 1,998 shares on 2/07/2004 and 1,257 shares on 2/07/05.

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