This species is restricted to a small area in the southern United States. It occurs in localized populations chiefly on the Mescalero Sands in southeastern New Mexico and Monahan Sandhills in adjacent Texas (Andrews, Crane, Gaines, Ward, and Winkler counties) (Degenhardt et al. 1996, Dixon 2000, Painter 2004). The elevational range extends from around 780 to 1,400 m (2,550 to 4,595 feet) (Painter 2004). The extent of occurrence is 2,312 sq. km in New Mexico, plus a smaller area in Texas. In New Mexico, potential and occupied habitat consists of 1,697 sq. km (655 sq. miles). The area of occupancy in Texas is much smaller than in New Mexico.