Calomys laucha (Fischer, 1814) . In Eschwege, J. Brasilien, Neue Bibliothek. Reisenb., 15(2):209.

TYPE LOCALITY: Paraguay, vicinity of Asunción (as restricted by Hershkovitz, 1962:153) .

DISTRIBUTION: N Argentina and Uruguay, SE Bolivia, W Paraguay, and WC Brazil.

SYNONYMS: bimaculatus, bonariensis, dubius, gracilipes, pusillus .

COMMENTS: Formerly included hummelincki (See Handley, 1976), musculinus (see Massoia et al., 1968), and tener (see species account). Attribution of pusillus follows Hershkovitz (1962; also see Osgood, 1943:239).