. Sibley (1950:129)
reidentified them, as well as a series from Sierra de Guadalupe, as _P.
e. orientalis_. The size of the testes (12x7 mm.) of No. 32154 as well
as the date (June 25) on which it was obtained suggests breeding by the
Rufous-sided Towhee in southeastern Coahuila.

*_Pipilo fuscus potosinus_ Ridgway.--_Specimens examined:_ total 3:
[Male] 32155 from 7 mi. S, 4 mi. E Bella Union, 7200 ft., June 25,
1952; [Male] 31676 from the west foot of Pico de Jimulco, 5000 ft.,
April 5, 1953, weight, 45 gms.; and sex ? 29560 from 7 mi. S, 1 mi. E
Gomez Farias, 6500 ft., November 19, 1949, weight, 46.5 gms.

The subspecies _potosinus_ has been recorded from several localities in
Coahuila. Davis (1951:70) listed the following localities in the State
from which _P. f. potosinus_ has been collected: Muralla, San Lazaro
Mountains, 50 mi. S Monclova, 2850 ft., Saltillo; Saltillo (Chorro de
Agua); 19 mi. W Saltillo; Cresta Blanca, 12 mi. W Saltillo, 5500 ft.;
Diamante Pass, 11 mi. S Saltillo, 6000-8000 ft.; and Carneros. Miller,
Friedmann, Griscom, and Moore (1957:358) recorded a "small juvenile"
from El Diamante on July 5. Sutton and Burleigh (1939a:45) recorded _P.
f. texanus_ from Diamante Pass on March 6. I suspect that Davis (_op.
cit._) reidentified the specimen concerned from Diamante Pass as _P. f.
potosinus_. Burleigh and Lowery (1942:207) indicated that _P. f.
potosinus_ "was fairly common and of general distribution in the area,
occurring both on the arid plateau about Saltillo and on the mountain
sides up to an elevation of about 8,000 feet." Nos. 32155, 31676, and
29560 are typical for _P. f. potosinus_. The size of the testes (14x7
mm.) of No. 32155 suggests breeding by the Brown Towhee in southeastern
Coahuila.

*_Pipilo fuscus texanus_ van Rossem.--_Specimen examined:_ one,
[Female] 31103, from 10 mi. S, 5 mi. E Boquillas, 1500 ft., March 5,
1952, weight, 46.9 gms.

This subspecies of the Brown Towhee occurs in northwestern Coahuila
south through the Sierra del Carmen. Miller (1955a:176) reported that
his series of Brown Towhees from the Sierra del Carmen agreed
satisfactorily with _texanus_ although revealing some sign of
intergradation with _potosinus_. Davis (1951:70) thought that _P. f.
potosinus_ is present in northern as well as southern Coahuila. Miller
(1955a:176), however, remarked that _P. f. texanus_ is more
characteristic of the population of Brown Towhees of northwestern
Coahuila. He indicat