ellow-breasted Chat is uncommon in Coahuila. Miller, Friedmann,
Griscom, and Moore (1957:265) listed _I. v. virens_ from Coahuila.
Findley saw a Yellow-breasted Chat 2 mi. S and 3 mi. E San Juan de
Sabinas on June 22, 1952. The sizes of the testes (7x4 mm.; 12 mm.) of
Nos. 32105-32106, the size of the largest ovum (2 mm.) of No. 32107,
and the dates (June 19, 20) on which these specimens were obtained
indicate breeding by _I. v. virens_ in northeastern Coahuila, an area
southwest of the previously documented breeding range.

**_Icteria virens auricollis_ (Deppe).--Miller, Friedmann, Griscom, and
Moore (1957:264) listed this subspecies of the Yellow-breasted Chat as
recorded from Coahuila.

_Wilsonia pusilla pileolata_ (Pallas).--_Specimens examined:_ total 3:
[Male] 31501 and [Female] 31500 from Sierra del Pino (=5 mi. S, 3 mi. W
Acebuches), May 13 and 14, 1954, measurements: wing, 59, 55 mm.; tail,
50, 49 mm.; culmen, 8, 8.5 mm.; tarsus, 16, 16 mm.; weight: 6, 7 gms.;
and [Male] 31663 from the north foot of Sierra Guadalupe (=10 mi. S, 5
mi. W General Cepeda), 6500 ft., April 21, 1953, measurements: wing, 58
mm.; tail, 46 mm.; culmen, 8.5 mm.; tarsus, 16 mm.; weight, 7 gms.

Wilson's Warbler is a common spring and probably fall migrant in
Coahuila. Miller (1955a:173) took spring migrants of _W. p. pileolata_
from April 9 to April 27; he found _W. p. pileolata_ at 4800 feet and
at 7000 feet. Amadon and Phillips (1947:579) saw a Wilson's Warbler at
Las Delicias on August 17. Burleigh and Lowery (1942:204) found
Wilson's Warbler to be the most abundant of the warblers that they
recorded in southeastern Coahuila. They saw _W. p. pileolata_ on the
top of the high ridges and in the arid desert country in the
southeastern section of the State. Several specimens were collected by
Burleigh and Lowery (_loc. cit._) including an immature male from the
Chorro del Agua on April 19. Dickerman saw Wilson's Warblers 16 mi. E
and 18 mi. N Ocampo on May 7, 1954, and at San Marcos (=20 mi. S Cuatro
Cienegas) on May 4, 1954. The sizes of our specimens as well as their
color (bright olive-green above, bright yellow below) are typical for
the subspecies _pileolata_.

_Setophaga ruticilla ruticilla_ (Linnaeus).--The American Redstart
seems to be uncommon in Coahuila. Miller, Friedmann, Griscom, and Moore
(1957:268) listed one specimen of _S. r. ruticilla_ from the State.

*_Setophaga picta picta_ Swainson.--_Specimens examined:_ total 2: