Microtus umbrosus Merriam, 1898 . Proc. Biol. Soc. Wash., 12: 107.

REVIEWED BY: J. Ramirez-Pulido (JRP); G. Urbano-V. (GUV).

TYPE LOCALITY: Mexico, Oaxaca, Mt. Zempoaltepec, 8200 ft. (2499 m) .

DISTRIBUTION: Known only from the vicinity of the type locality.

COMMENT: This is the only species in the subgenus Orthriomys; see Anderson, 1959, Univ. Kans. Publ. Mus. Nat. Hist., 9:415-511. Martin, R. A., 1974, in Webb, ed., Pleistocene Mammals of Florida, p. 61, suggested that this species "may eventually" be included in Neodon .

ISIS NUMBER: 5301410008080045001.