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Range DescriptionThe species is widely distributed, occurring in the Mexican states of Aguascalientes, Chihuahua, Coahuila, Durango, Mxico State, Guanajuato, Hidalgo, Jalisco, Nuevo Len, Puebla, Quertaro, San Luis Potos, Sonora, Tamaulipas, Veracruz, and Zacatecas (Hernndez et al. 2004). It is widely distributed in the Chihuahuan Desert Region (Martnez-valos and Jurado 2005, Goettsch and Hernndez 2006). In the United States it occurs in Arizona, Colorado, New Mexico, and Texas (Hernndez et al. 2004). The population in the Tehuacn-Cuicatln region in Puebla is disjunct from the main population. Records from Baja California Sur require confirmation (H. Hernndez pers. comm. 2009).