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Range DescriptionThe species is widely distributed, occurring in the Mexican states of Aguascalientes, Chihuahua, Coahuila, Durango, México State, Guanajuato, Hidalgo, Jalisco, Nuevo León, Puebla, Querétaro, San Luis Potosí, Sonora, Tamaulipas, Veracruz, and Zacatecas (Hernández et al. 2004). It is widely distributed in the Chihuahuan Desert Region (Martínez-Ávalos and Jurado 2005, Goettsch and Hernández 2006). In the United States it occurs in Arizona, Colorado, New Mexico, and Texas (Hernández et al. 2004). The population in the Tehuacán-Cuicatlán region in Puebla is disjunct from the main population. Records from Baja California Sur require confirmation (H. Hernández pers. comm. 2009).