Range Description

This species is endemic to the southern United States. The range includes two small disjunct areas: the lower benches of the Chinati Mountains in southwestern Presidio County, Texas (Dixon 2000), and the vicinity of Antelope Pass in the Peloncillo Mountains, Hidalgo County, New Mexico (Degenhardt et al. 1996). The elevational range is 1,300 to 1,450 m (4,265 to 4,755 feet) in New Mexico (Degenhardt et al. 1996), 275 to 450 m (900 to 1,475 feet) in Texas (Scudday 1973). Presidio County, Texas, encompasses about 10,000 sq. km. The range in New Mexico consists of fragmented populations in an area of approximately 3 x 5 miles (about 40 sq. km (see New Mexico Department of Game and Fish 1996). Hence range extent is not more than about 10,000 sq. km and probably is much less.