A chipmunk of the Sierra Madre Occidental in western Mexico. It inhabits mountain forests containing pine, oak, and juniper.
Howell's 1929 account describes a browner back, dark dorsal stripes brown except for the black central stripe, dull-white light stripes, a paler head, a darker underside of the tail and larger average ears than typical bulleri.
The IUCN species assessment records it in Sierra Madre Occidental forests containing pine, oak, juniper, madrones, and manzanita.
An extinction-risk assessment has not been added yet.