Sigmodon leucotis Bailey, 1902 . Proc. Biol. Soc. Wash., 15: 115.

TYPE LOCALITY: Mexico, Zacatecas, Sierra de Valparaiso, 2653 m .

DISTRIBUTION: S. Nuevo Leon and S.W. Chihuahua to C. Oaxaca (Mexico).

COMMENT: Includes alticola; see review by Shump and Baker, 1978, Mamm. Species, 96:1, and Baker, 1969, Mise. Publ. Univ. Kans. Mus. Nat. Hist., 51: 213-223.

ISIS NUMBER: 5301410008054007001 as S. leucotis .

5301410008054002001 as S. alticola .