os. 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.

This subspecies of the Black-throated Sparrow occurs in northwestern
Coahuila. Miller (1955a:176) stated that the Black-throated Sparrow was
moderately common in the open desert scrub at the base of the Sierra
del Carmen below 4800 feet. He said that the series of Black-throated
Sparrows from the Sierra del Carmen "resembles most the race _opuntia_
of western Texas ... but shows some intergradation toward _grisea_ of
southern Coahuila and toward _A. b. bilineata_ of eastern Coahuila." He
remarked also that the specimen from Jardin del Sur, which Marsh and
Stevenson (1938:287) reported as _A. b. grisea_, was in extremely worn,
dirty summer plumage and contributed nothing reliable to racial
determination.

*_Amphispiza bilineata grisea_ Nelson.--_Specimen examined:_ one,
[Male] 31665, from the north foot of Sierra Guadalupe (=10 mi. S, 5 mi.
W General Cepeda), 6500 ft., April 25, 1953.

_A. b. grisea_ is the subspecies of Black-throated Sparrow in southern
Coahuila. Burleigh and Lowery (1942:208) saw this sparrow "frequently
on the arid plateau around Saltillo" and obtained specimens there that
were identified as _A. b. grisea_. Amadon and Phillips (1947:581) saw
individuals on August 8 and 28 that were feeding "fledged young near
Saltillo." The size of its wing (68.5 mm.), the slaty color of its
back, and the size (8 mm.) of the white spot on its lateral tail
feather suggest that No. 31665 is characteristic of _A. b. grisea_. The
size of the testes (4.5x3 mm.) of No. 31665 indicates that _A. b.
grisea_ may breed in southern Coahuila.

*_Junco phaeonotus palliatus_ Ridgway.--_Specimens examined:_ total 3:
[Male] 35402 (skeleton only) from 13 mi. E San Antonio de las Alazanas,
9345 ft., April