Ammospermophilus interpres (Merriam, 1890) . N. Am. Fauna, 4:21.

TYPE LOCALITY: "El Paso, [El Paso Co.], Texas [USA]."

DISTRIBUTION: New Mexico and W Texas (USA) to Coahuila, Chihuahua, and Durango (Mexico).

COMMENTS: Most divergent species of the genus (Bolles, 1981), and probable primitive sister-species to remainder (Hafner, 1981). Reviewed by Best et al. (1990b, Mammalian Species, 365).