Range Description

This species occurs in northwestern Mexico, extending into southwestern United States. The range encompasses central and southern Arizona, extreme southwestern New Mexico (Guadalupe Canyon, Hidalgo County; Painter 1993, Herpetological Review 24: 155), Sonora, portions of southwestern Chihuahua, and northern Sinaloa. It is also present on Isla Tiburon in the Gulf of California (Parker 1974, Degenhardt et al. 1996, Grismer 2002, Stebbins 2003). Stebbins (2003) mapped the range as extending through southern Sinaloa to at least Nayarit, but this appears to be an error. Elevational range extends from sea level to about 1,460 m (4,800 feet) (Stebbins 2003).