Graomys griseoflavus (Waterhouse, 1837) . Proc. Zool. Soc. Lond., 1837:28.

TYPE LOCALITY: Argentina, Rio Negro Prov., mouth of Rio Negro .

DISTRIBUTION: S Bolivia, W Paraguay, and nearby Brazil, south to S Chubut Prov., Argentina.

SYNONYMS: cachinus, centralis, chacoensis, lockwoodi, médius .

COMMENTS: Even with removal of G. domorum, specific homogeneity of included populations and list of species-group synonyms remain highly suspect.