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Range DescriptionThis species is known only from three adjacent localities in the valley of the Rio Zongo, Departamento La Paz, Bolivia. Based on similarly distributed small mammal species, this species is hypothesized to occur more widely, likely on the eastern Andean slope humid montane forests from central Bolivia through southeast Peru (Voss et al., 2004). There is a second record near Coroico, which was from disturbed forest. Surveys into the north in Madidi National Park have failed to find this species (J. Vargas pers. comm.). It is known only from montane humid forest, from 1,800 to 3,000 m (Voss et al. 2004; J. Vargas pers. comm.).