ouy.--_Specimens examined:_ total 2:
[Male] 31659 from the north slope of Sierra Guadalupe (=10 mi. S, 7 mi.
W General Cepeda), 7000 ft., April 20, 1953; and [Female] 31658 from
the north slope of Sierra Guadalupe (=10 mi. S, 5 mi. W General
Cepeda), 6700 ft., April 15, 1953.

Typical representatives of this Black-eared Bushtit are present in the
southeastern sector of Coahuila. The backs of Nos. 31658-31659 differ
slightly in color from the backs of typical representatives of
_lloydi_. I suspect that the specimens from the Sierra Guadalupe are
intergrades between _lloydi_ and _iulus_.

Burleigh and Lowery (1942:197) took two males and two females of
_Psaltriparus melanotis iulus_ (they called their specimens
_Psaltriparus minimus iulus_) at Saltillo and stated that their
specimens tended to approach _lloydi_ rather than being typical
_iulus_. Sutton and Burleigh (1939a:36) recorded _P. m. iulus_ only at
Diamante Pass where they took two specimens.

*_Sitta carolinensis nelsoni_ Mearns.--Miller (1955a:169) reported that
this subspecies of the White-breasted Nuthatch breeds and was common in
the oaks and open conifers from 6500 to 8000 feet in the Sierra del
Carmen and stated also that the populations of the White-breasted
Nuthatch in "the Chisos Mountains [of Texas] and the Sierra del Carmen
seem best regarded as a stage in the cline of which _nelsoni_ and
_mexicana_ are end points, although falling closer to _nelsoni_."

*_Sitta carolinensis mexicana_ Nelson and Palmer.--_Specimens
examined:_ total 2: [Male] 31669 and [Female] 31670 from the Canyon d.
Meco, Sierra Guadalupe (=10 mi. S General Cepeda), 6500 ft., April 23,
1953, weights, 17, 18 gms.

Typical populations of this White-breasted Nuthatch occur in southern
Coahuila. Ridgway (1904:449) listed _S. c. mexicana_ from Sierra
Guadalupe in southern Coahuila. The underparts of our specimens are
darker than in _nelsoni_, and their bills (culmen, 15, 13 mm.) are
shorter than the average ([Male], 19.8 mm.; [Female], 18.6 mm.
[Ridgway, 1904:447]) in _nelsoni_. The large size of the testes (5x3
mm.) of No. 31669 suggests breeding by _S. c. mexicana_ in Sierra
Guadalupe.

*_Sitta pygmaea melanotis_ van Rossem.--In Coahuila the Pigmy Nuthatch
seems to be locally common. Miller (1955a:169) reported it so between
7500 and 8000 feet in pine-oak on the mesa tops and in the heads of
canyons of the Sierra del Carmen and noted that it breeds there. Hardy
saw the Pigmy Nut