Peromyscus melanocarpus Osgood, 1904 . Proc. Biol. Soc. Washington, 17:73.

TYPE LOCALITY: Mexico, Oaxaca, Cerro Zempoaltepec, above Yacochi .

DISTRIBUTION: Cloud forest of Sierra de Juarez and Sierra de Zempoaltepec, NC Oaxaca, Mexico.

COMMENTS: Range and distinctive morphology substantiated by Huckaby (1980). See Rickart and Robertson (1985, Mammalian Species, 241). P. megalops species group.