Kalinowski’s oldfield mouse has a finely grizzled brownish-gray back, a fulvous belly, and a dark tail. It occurs in humid montane forests of the central Peruvian Andes.
The dorsal fur is finely grizzled brownish gray, and the underside has a dirty fulvous tone. Its slender tail is dark and finely haired, without a white tip tuft.
Specimens have been collected on the ground in humid montane forest. Reported foods include plant material, especially Piperaceae seeds, and arthropods.
An extinction-risk assessment has not been added yet.