This pocket mouse lives in western Ecuadorian forests. Its back is dark gray to blackish, contrasting with its white underside.
The dorsal fur is dark gray to blackish and contrasts sharply with the white fur on the underside. The animal is robust, with a notably broad snout.
It has been recorded in seasonal evergreen forest in western Ecuador. The species description covers forests from lowlands to the western Andean foothills.
An extinction-risk assessment has not been added yet.