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Range DescriptionThis species mainly in northwestern Mexico, extending into extreme southwestern United States (Lieb 1990, Stebbins 2003). In Mexico it is known from northwestern Chihuahua south through western slope foothills and barrancas of Sierra Madre Occidental of Chihuahua, Sonora, Durango, Sinaloa, Nayarit, northern Jalisco, and Zacatecas. It is also present on the coastal plain of central Sinaloa south through Nayarit, south to Bolaos and Gaudalajara in Jalisco. In the United States it is known from Pajarito, Baboquivari, Santa Rita, and the Huachuca mountains in Arizona, and from the Peloncillo Mountains (Guadalupe Canyon, Geronimo Trail) in New Mexico. Its elevational range extends from near sea level (in Mexico) to above 1,980 m, but it is generally above (1,220 m in the United States (Degenhardt et al. 1996, Stebbins 2003).