_Pooecetes gramineus confinis_ Baird.--The Vesper Sparrow seems to be an uncommon winter visitant in Coahuila. Miller (1955a:176) found _P. g. confinis_ "on two occasions in the grass of the dry cienega at the head of Corte Madera Canyon at 7500 feet" on April 9 and 14 in the Sierra del Carmen. In April, Burleigh and Lowery (1942:208) found _P. g. confinis_ only in Diamante Valley where this sparrow "appeared to be quite uncommon." Sutton and Burleigh (1939a:45) took a male _P. g. confinis_ at San Pedro on January 29. *_Chondestes grammacus strigatus_ Swainson.--_Specimen examined:_ one, [Male] 32156, from 8 mi. N, 2 mi. W Piedras Negras, June 18, 1952. The Lark Sparrow is not uncommon in Coahuila. Miller (1955a:176) saw one male, "apparently on a breeding territory, on April 27 in an open, rather barren desert flat adjoining the lower part of Boquillas wash at 4600 feet." He reported that Marsh took a young of the year, still largely in juvenile plumage, on September 6 in the Sierra del Carmen. Amadon and Phillips (1947:580) remarked that Lark Sparrows were common "about Las Delicias" after August 18. Findley saw Lark Sparrows 2 mi. W Jimenez on June 19, 1952, and 2 mi. S and 11 mi. E Nava on June 15, 1952. Dickerman saw Lark Sparrows at San Marcos on May 4, 1954. The pale and narrowly streaked upperparts of No. 32156 are typical for _C. g. strigatus_. The size of the testes (9x4 mm.) of No. 32156 and the date (June 18) on which it was obtained suggest breeding by the Lark Sparrow in northeastern Coahuila. *_Aimophila ruficeps tenuirostris_ Burleigh and Lowery.--This subspecies of the Rufous-crowned Sparrow is resident in the northern part of Coahuila. Miller (1955a:176) remarked that the species "ranged up to 7000 feet on open south-facing slopes within the oak belt" of the Sierra del Carmen. Specimens collected by him showed no approach to _boucardi_ of southern Mexico and seem to be closest to _tenuirostris_. Miller referred the specimen that Marsh and Stevenson (1938:287) took on August 22 in Chuperosa Canyon to _tenuirostris_ rather than _boucardi_. Miller, Friedmann, Griscom, and Moore (1957:376) listed _A. r. tenuirostris_ from 50 mi. S Monclova on November 8 and 10. *_Aimophila ruficeps boucardi_ (Sclater).--This subspecies of the Rufous-crowned Sparrow is common in southern Coahuila. Burleigh and Lowery (1942:208) indicated that _A. r. boucardi_ was common throughout the mountainous areas and to some extent in the arroyos of the open desert country of southeastern Coahuila. Sutton and Burleigh (1939a:46) took a female _A. r. boucardi_ "near Diamante Pass." Ridgway (1901:252) listed _A. r. boucardi_ from Carneros. _A. r. tenuirostris_ and _boucardi_ seem to intergrade in central and even southern Coahuila. Miller, Friedmann, Griscom, and Moore (1957:376) recorded intermediate populations of the Rufous-crowned Sparrow from 12 mi. W Saltillo.