*_Aimophila cassinii_ (Woodhouse).--_Specimens examined:_ total 2: [Male] 32157 from 9 mi. S, 11 mi. E Sabinas, June 14, 1952; and [Male] 32158 from 18 mi. S, 14 mi. E Tanque Alvarez, 4000 ft., July 6, 1952. Cassin's Sparrow seems to be common in Coahuila. The AOU Check-list Committee (1957:603) listed _A. cassinii_ from 10 mi. E Saltillo. Miller, Friedmann, Griscom, and Moore (1957:378-379) recorded Cassin's Sparrow from Sabinas, on April 25; from 25 mi. SW Monclova, on November 20; from 12 mi. W Saltillo, on September 28; and from 10 mi. NE Saltillo, on July 3. These authors stated that Cassin's Sparrow was breeding 10 mi. NE Saltillo. The sizes of the testes (5x3 mm.; 7x5 mm.) of Nos. 32157-32158, respectively, and the dates (June 14, July 6) on which they were obtained are additional evidence of breeding by Cassin's Sparrow in Coahuila. *_Amphispiza bilineata bilineata_ (Cassin).--_Specimens examined:_ total 5: [Male] 32159 and [Female] 32163 from 2 mi. W Jimenez, 850 ft., June 20, 1952; [Male] 32160 from 8 mi. N, 2 mi. W Piedras Negras, June 18, 1952; [Male] 32161 and sex ? 32162 from 5 mi. N, 19 mi. W Cuatro Cienegas, 3250 ft., July 5, 1952. The Black-throated Sparrow is common in Coahuila. Typical representatives of _A. b. bilineata_ occur in eastern Coahuila. The center of the State is occupied by intergrades between _A. b. bilineata_, _opuntia_, and _grisea_. Miller, Friedmann, Griscom, and Moore (1957:381) reported _A. b. bilineata_ from the "Saltillo area." Hellmayr (1938:539) recorded _A. b. bilineata_ from Sabinas. The sizes (13, 14 mm.) of the white spot on the lateral tail feathers of Nos. 32163 and 32160, respectively, suggest _A. b. bilineata_. The short wing (61-64.5 mm.) and the lighter and browner color of the backs of Nos. 32163, 32160, and 32161 are suggestive of _A. b. bilineata_. Nevertheless, the size (8 mm.) of the white spot on the lateral tail feather of No. 32161 indicates intergradation with _A. b. opuntia_. The sizes of the testes (6x4 mm.; 8 mm.) of Nos. 32160 and 32161, the size of the largest ovum (2 mm. in diameter) of No. 32163, and the presence of the juveniles from 2 mi. W Jimenez and 5 mi. N and 19 mi. W Cuatro Cienegas indicate breeding by _A. b. bilineata_ in Coahuila. *_Amphispiza bilineata opuntia_ Burleigh and Lowery.--_Specimens examined:_ total 2: [Female] 31106 from 10 mi. S, 5 mi. E Boquillas, 1500 ft., March 3, 1952; weight, 12.3 gms.; and [Male] 31108 from 35 mi. S, 14 mi. E Boquillas, 2350 ft., March 12, 1952.