This squirrel is restricted to the Sierra de San Pedro Mártir in Baja California, Mexico. It lives in high-elevation conifer forest and uses tree hollows for nests.
The back is pale gray-brown with a reddish-yellow midline band. The underside is white with a few yellow spots, and a distinct black stripe marks each side.
It lives in high-elevation conifer forest in the Sierra de San Pedro Mártir, nests in tree cavities, and eats seeds from current-year fir and pine cones.
An extinction-risk assessment has not been added yet.