imophila 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.

*_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
N