Hoffmeister D. F. (1986). Mammals of Arizona. The University of Arizona Press 175-179

Otospermophilus variegatus in Arizona:  

Otospermophilus variegatus is a member of Marmotini, the marmots, prairie dogs, and Holarctic ground squirrels, which is itself a member of Sciuridae, the squirrels. The largest of the Arizona ground squirrels, it is exceeded in size only by the prairie dogs of genus Cynomys. In Arizona, it is found throughout the state in rocky areas, but can otherwise be found in a variety of habitats, plant communities, and elevations.

For a list of specimens of Otospermophilus variegatus specimens housed at Arizona State University Natural History Collections, please follow this link: ASUMAC Otospermophilus variegatus records