Oligoryzomys flavescens (Waterhouse, 1837) . Proc. Zool. Soc. Lond., 1837:19.

TYPE LOCALITY: Uruguay, Maldonado .

DISTRIBUTION: SE Brazil, Uruguay, and Argentina (south to Chubut Prov.).

SYNONYMS: antoniae, occidentalis .

COMMENTS: Chromosomal variation reported and taxonomic implications discussed by Sbalqueiro et al. (1991).