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

TYPE LOCALITY: Venezuela, Sucre, Cumanâ .

DISTRIBUTION: Intermittently distributed in savannas over NE Colombia, N and E Venezuela, Guyana, Surinam, and N Brazil. Range amplified by Handley (1976), Husson (1978), and Voss (1992).

SYNONYMS: savannarum, venester.