Peromyscus pectoralis Osgood, 1904 . Proc. Biol. Soc. Washington, 17:59.

TYPE LOCALITY: Mexico, Queretaro, Jalpan .

DISTRIBUTION: SE New Mexico and C Texas, USA, south to N Jalisco and Hidalgo, Mexico.

SYNONYMS: collinus, eremicoides, laceianus.

COMMENTS: Revised by Schmidly (1972), who recognized three subspecies which correspond to patterns of genetic differentiation (Kilpatrick and Zimmerman, 1976). Consanguinity of included populations nevertheless suspect (see Avise et al., 1974a). See Schmidly (1974b, Mammalian Species, 49). P. boylii species group.