This mouse has a dark brown back and a two-colored tail shorter than its body. It was last recorded on the northwestern Peruvian coast in 1949, with no later records reported.
The back is dark brown, while the sides and belly are paler; the feet are brown. The tail is darker above and paler below, and is described as shorter than the body.
Its food, activity, and breeding in the wild are unknown. The last record was from 1949, and no later records have been reported.
An extinction-risk assessment has not been added yet.