Megadontomys thomasi (Merriam, 1898) . Proc. Biol. Soc. Wash., 12: 116.

TYPE LOCALITY: Mexico, Guerrero, mountains near Chilpancingo, 9700 ft. (2957 m) .

DISTRIBUTION: C. Guerrero, C. Veracruz, and C. Oaxaca (Mexico).

COMMENT: Includes cryophilus and nelsoni; see Musser, 1964, Occas. Pap. Mus. Zool. Univ. Mich., 636:13- 19, and Hall, 1981:717.

ISIS NUMBER: 5301410008039056001 as Peromyscus thomasi .