Sigmodon alstoni (Thomas, 1881) . Proc. Zool. Soc. Lond., 1880:691.

TYPE LOCALITY: Venezuela, Sucre, Cumana Dist .

DISTRIBUTION: N. and E. Venezuela; S. Guyana; Surinam; N. Brazil.

COMMENT: Included in hispidus by Hershkovitz, 1955, Fieldiana Zool., 37:639-673; but considered a distinct species by Hershkovitz, 1966, Z. Saugetierk., 31: 129, Handley, 1976, Brigham Young Univ. Sci. Bull. Biol. Ser., 20(5):53, and Husson, 1978:427-429. Included in genus Sigmomys by Handley, 1976, Brigham Young Univ. Sci. Bull. Biol. Ser., 20(5):53; but see Husson, 1978:427-429, and Hershkovitz, 1966, Z. Saugetierk., 31: 129, who considered Sigmomys a subgenus.