*_Parus sclateri eidos_ (Peters).--_Specimens examined:_ total 4:
[Female] 32083 from 7 mi. S, 4 mi. E Bella Union, 7200 ft., June 25,
1952; [Male] 31609 from 2 mi. E Mesa de Tablas, 9000 ft., January 15,
1954; [Male] 31656 and [Female] 31655 from the north slope of Sierra
Guadalupe (=11 mi. S, 7 mi. W General Cepeda), 7800 ft., April 20, 1953.

The Mexican Chickadee is common in southeastern Coahuila. Miller,
Friedmann, Griscom, and Moore (1957:133) stated that _P. s. eidos_ and
_P. s. sclateri_ intergrade in southern Coahuila. The specimens that I
have examined also show signs of intergradation, but are closer to _P.
s. eidos_.

Sutton and Burleigh (1939a:36) reported taking specimens of _P. s.
eidos_ at Diamante Pass where they saw several individuals. Burleigh
and Lowery (1942:197) also observed these chickadees "in the pine woods
about the summit of Diamante Pass...." The size of the testes (6x5 mm.)
of No. 31656 and the fact that No. 31655 was incubating eggs at the
time it was obtained are evidence of breeding by this chickadee in the
State.

**_Parus sclateri sclateri_ Kleinschmidt.--Miller, Friedmann, Griscom,
and Moore (1957:133) stated that a specimen (or specimens?) of _P. s.
sclateri_ which showed evidence of intergradation with _P. s. eidos_
was obtained at El Diamante.

**_Parus atricristatus dysleptus_ Van Tyne.--_Specimen examined:_ one,
[Male] 31054 from 37 mi. S, 21 mi. E Boquillas, 4100 ft., March 13,
1952.

Two subspecies of the Black-crested Titmouse are present in Coahuila.
_P. a. dysleptus_ occurs in northwestern Coahuila. Miller (1955a:168)
stated that the Black-crested Titmouse, identified as _dysleptus_, was
the only representative of the genus _Parus_ in the Sierra del Carmen.
The weak extension of black onto the nape in No. 31054 suggests
intergradation between _P. a. dysleptus_ and _P. a. atricristatus_; the
latter lacks the black nape of _dysleptus_.

*_Parus atricristatus atricristatus_ Cassin.--_Specimens examined:_
total 4: [Female] 32084 from 12 mi. N, 12 mi. W Jimenez, 850 ft., June
19, 1952; sex ? 32085 from 2 mi. W Jimenez, 850 ft., June 20, 1952;
[Female] 31055 (skeleton only) from Fortin (=33 mi. N, 1 mi. E San
Geronimo), 3300 ft., on March 29, 1952; and [Female] 35399 (skeleton
only) from 3.5 mi. W, 22 mi. S Ocampo, December 15, 1953, weight, 16
gms.

Typical _P. a. atricristatus_ occurs in Coahuila in the southeastern
sector (Dixon, 1955:184). Black-crested Titmice int