er.--Sutton and Burleigh (1939a:34) noted
that the Gray Flycatcher was common "in the San Pedro region" and
collected two at San Pedro on January 29. Burleigh and Lowery
(1942:194) collected specimens "near the Chorro del Agua, at Saltillo,
and ... in the open desert some twenty miles west of Saltillo."

**_Empidonax affinis trepidus_ Nelson.--_Specimen examined:_ one,
[Male] 32750, from 13 mi. E San Antonio de las Alazanas, 9950 ft., July
6, 1955.

Ridgway (1907:576) previously reported the little known and poorly
defined Pine Flycatcher from Sierra Guadalupe. Because of its small
size (wing, 75 mm.; tail, 65 mm.), No. 32750 is referable to _E. a.
trepidus_. No indication of breeding of the subspecies _trepidus_
exists for Coahuila. Nevertheless, the date (July 6) on which No. 32750
was obtained suggests that this flycatcher may breed in southeastern
Coahuila.

*_Empidonax difficilis hellmayri_ Brodkorb.--_Specimen examined:_ one,
[Male] 31469, from Sierra del Pino (=5 mi. S, 3 mi. W Acebuches), May
13, 1954, measurements: wing, 71 mm.; tail, 65 mm.; culmen, 11.5 mm.;
tarsus, 17.0 mm.

Miller (1955a:167) reported that the Western Flycatcher breeds in the
Sierra del Carmen, from 6800 to 7500 feet. According to Miller,
Friedmann, Griscom, and Moore (1957:91), this subspecies has been
recorded from Sierra Guadalupe. No. 31469 closely resembles, especially
in measurements, the specimens of the Western Flycatcher from the
Chisos Mountains of Texas as reported by Brodkorb (1935:2).

_Empidonax difficilis_ subsp.--Burleigh and Lowery (1942:194) obtained
a specimen of _E. difficilis_ "near the summit of Diamante Pass" that
they tentatively identified as _E. d. salvini_. However, they
considered the specimen as possibly _E. d. immemoratus_ or _E. d.
occidentalis_.

Localities listed by Miller, Friedmann, Griscom, and Moore (1957:92) of
_E. d. salvini_ and _E. d. immemoratus_ are south of twenty-three
degrees north latitude whereas the range of _E. d. occidentalis_
includes parts of Nuevo Leon north of twenty-three degrees north
latitude (_occidentalis_ intergrades with _hellmayri_ at Cerro Potosi,
Nuevo Leon, [Miller, Friedmann, Griscom, and Moore, _loc. cit._]).
Thus, the specimen from Diamante Pass probably is either _E. d.
hellmayri_ or _E. d. occidentalis_.

**_Empidonax fulvifrons pygmaeus_ Coues.--Miller, Friedmann, Griscom,
and Moore (1957:95) listed this subspecies of the Buff-breasted
Flycatcher from the Sier