*_Molothrus ater obscurus_ (Gmelin).--_Specimens examined:_ total 18: [Male] [Male] 32112-32115 from 12 mi. N, 12 mi. W Jimenez, 850 ft., June 18 and 19, 1952; [Male] [Male] 32108-32111, [Male] 32116, and [Female] [Female] 32117-32120 from 2 mi. W Jimenez, 850 ft., June 20, 1952; [Female] 32491 from Las Margaritas, August 4, 1955; [Male] 31511 and [Female] 31510 from 16 mi. E, 18 mi. N Ocampo, May 8 and 7, 1952; and [Male] [Male] 35409-35410 (skeletons only) from 4 mi. N San Isidro, May 11, 1954. This subspecies of the Brown-headed Cowbird is common in Coahuila and breeds there. Amadon and Phillips (1947:579) suggested that _M. a. obscurus_ breeds at Las Delicias. Burleigh and Lowery (1942:206) saw the Brown-headed Cowbird in "small numbers on the outskirts of Saltillo...." Measurements of the adult males that I have examined are: wing, 101.1 mm. (97-106); tail, 66.5 mm. (62-69); tarsus, 25.6 mm. (24.5-28); culmen, 17.3 mm. (16-18.5). Measurements of the adult females that I have examined are: wing, 92.3 mm. (90-97); tail, 60.1 mm. (56.5-62.5); tarsus, 23.5 mm. (22.5-24); culmen, 14.4 mm. (14-15). The sizes of the testes of three of the males (6-7 mm. long) and of the largest ova of four of the females (6-9 mm. in diameter) indicate breeding by this subspecies in Coahuila, as does the small size of one of the juvenile males (tail, 33.5 mm. long). _Piranga ludoviciana_ (Wilson).--In Coahuila the Western Tanager occurs fairly commonly as a migrant. There are no records of it breeding in the State. Miller (1955a:174) remarked that Marsh took a migrant Western Tanager at Jardin del Sur in the Sierra del Carmen on September 7. Amadon and Phillips (1947:579) took an adult male Western Tanager at Las Delicias on August 12. Miller, Friedmann, Griscom, and Moore (1957:305) also recorded this tanager from 12 mi. W Saltillo. Dickerman saw Western Tanagers in the Sierra del Pino on May 12, 1954, and 16 mi. E and 18 mi. N Ocampo on May 7, 1954. *_Piranga flava dextra_ Bangs.--_Specimen examined:_ one, [Male] 31526, from Sierra del Pino (=5 mi. S, 3 mi. W Acebuches), May 12, 1954, weight, 41 gms. Miller (1955a:174) found this subspecies of the Hepatic Tanager "in the pine-oak belt at 7000 feet on April 12 [in the Sierra del Carmen], when a male was seen and a female taken." No. 31526 was with a female when taken; this male was not fat and its testes were not enlarged. The size of the wing (105.5 mm.) of No. 31526 represents the extreme maximum in this subspecies.