This small rodent has a white underside and a relatively short tail that is brown above and white below. It is reported from two localities in Catamarca, northwestern Argentina.
The sides lack a buff wash and the underside is white. The relatively short tail is brown above and white below.
The summit of Cerro de Ambato, one of the type localities, is described as grassland. This describes that site and does not establish a general habitat preference for the species.
An extinction-risk assessment has not been added yet.