*_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 Nuthatch 13 mi. E San Antonio de las Alazanas on July 6, 1955. _Certhia familiaris americana_ Bonaparte.--_Specimens examined:_ total 2: [Female] 31612 from the base of Don Martin Dam, November 27, 1953, skull partially unossified; and [Female] 31587 from 20 mi. S Ocampo, 6500 ft., April 5, 1954, weight, 7 gms. This subspecies of the Brown Creeper can be considered a sparse winter visitant to Coahuila. Van Hoose (1955:302) reported that Nos. 31612 and 31587 constitute the southernmost records of _C. f. americana_ and represent the first records of occurrence of _americana_ in Mexico. _Certhia familiaris montana_ Ridgway.--Miller (1955a:169) reported this subspecies of the Brown Creeper, which he assumed to be a winter visitant or a migrant, in the Sierra del Carmen. He (_loc. cit._) remarked also that the higher conifers would seem to constitute favorable habitat for nesting by the Brown Creeper, but did not find any evidence of a breeding population of creepers in the Sierra del Carmen. Miller, Friedmann, Griscom, and Moore (1957:143) reported _C. f. montana_ from San Lazaro Mountain on November 9. **_Certhia familiaris albescens_ Berlepsch.--_Specimens examined:_ total 3: sex ? 32805 from 13 mi. E San Antonio de las Alazanas, July 7, 1955; [Male] [Male] 31610-31611 from 3 mi. S, 13 mi. E San Antonio de las Alazanas, 8900 ft., January 12, 1954.