Akodon azarae (Fischer, 1829) . Synopsis Mamm., p. 325.

TYPE LOCALITY: Argentina, Entre Rios Prov., about 30°30'S latitude between the Uruguay and Parana Rivers .

DISTRIBUTION: NE Argentina, southernmost Bolivia, Paraguay, Uruguay, and extreme S Brazil.

SYNONYMS: arenicola, bibianae, hunteri .

COMMENTS: Subgenus Akodon . Olrog and Lucero (1981) maintained arenicola as a species distinct from A. azarae, but karyotypic and other data support their union (Vitullo et al., 1986; Ximenez et al., 1972).