Neotoma micropus Baird, 1855 . Proc. Acad. Nat. Sci. Philadelphia, 7:333.

TYPE LOCALITY: Mexico, Tamaulipas, Charco Escondido .

DISTRIBUTION: SE Colorado and SW Kansas through W Texas and most of New Mexico, USA; south in Mexico to N Chihuahua, E San Luis Potosi, and S Tamaulipas.

SYNONYMS: canescens, leucophaea, littoralis, planiceps, surberi.

COMMENTS: Subgenus Neotoma . Limited hybridization documented with N. floridana in Oklahoma (Birney, 1973) and believed probable with N. albigula in Colorado (Finley, 1958) and Coahuila (Anderson, 1969b); also see comments under N. albigula and N. floridana . See Braun and Mares (1989, Mammalian Species, 330).