The size (wing, 50 mm.; tail, 43 mm.) of No. 31056 is small for typical representatives of _A. f. ornatus_. The yellow of the head of No. 31056 is darker than that of the other subspecies of the Verdin, and I have accordingly allocated the specimen to _A. f. ornatus_.
*_Psaltriparus melanotis lloydi_ Sennett.--_Specimens examined:_ total 5: [Male] 31058 and [Female] 31057 from 37 mi. S, 21 mi. E Boquillas, 4100 ft., March 13, 1952; [Male] 31060 and [Female] 31059 from Sierra de la Encantada (=38 mi. S, 23 mi. E Boquillas), 4400 ft., March 15, 1952; and [Male] 35407 (skeleton only) from Sierra del Pino (=5 mi. W, 3 mi. S Acebuches), 6200 ft., May 14, 1954.
The Black-eared Bushtit is common in Coahuila. Typical representatives of _P. m. lloydi_ in the northern part of the State range from 4100 feet to 8000 feet. Miller (1955a:168-169) reported _P. m. lloydi_ breeding in the Sierra del Carmen. Marsh and Stevenson (1938:287) obtained a male in the Sierra del Carmen at El Jardín. The size of the testes (3.5 mm.) of No. 31058 suggests breeding by the Black-eared Bushtit 37 mi. S and 21 mi. E Boquillas.
**_Psaltriparus melanotis iulus_ Jouy.--_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_."