Sigmodon ochrognathus Bailey, 1902 . Proc. Biol. Soc. Washington, 15:115.

TYPE LOCALITY: USA, Texas, Brewster Co., Chisos Mountains, 8000 ft .

DISTRIBUTION: SE Arizona, extreme SW New Mexico, and Transpecos, Texas, USA, south to C Durango, Mexico. Northern outlier population may persist in Guadalupe Mtns, Transpecos, Texas (see Stangl and Dalquest, 1991).

SYNONYMS: baileyi, madrensis, montanus .

COMMENTS: See Baker and Shump (1978b, Mammalian Species, 97).