The rufous-bellied bolo mouse is a small rodent known from high grasslands above the Yungas.
Its back is dark brown with agouti patterning, and its belly is cinnamon-colored. It has a white mark on the chin and throat; some individuals have a yellow ring around the eye.
It has been recorded in highland grasslands at elevations of 1,500–3,000 m.
Head-and-body length is 98–124 mm, and tail length is 63–89 mm.
Hind-foot length is 23–29 mm, and ear length is 11–17 mm.
An extinction-risk assessment has not been added yet.