black-necked garter snake (Reptiles of Fort Bowie NHS)

black-necked garter snake

Thamnophis cyrtopsis

Summary ⁴

Thamnophis cyrtopsis, the blackneck garter snake, is a species of garter snake of the genus Thamnophis, mainly found near water in mountainous or hilly areas of the southwestern United States and Mexico.

Distribution ⁵

Global Range: (200,000 to >2,500,000 square km (about 80,000 to >1,000,000 square miles)) The range extends from southern Colorado and Utah south through Arizona, New Mexico, western and central Texas, and much of Mexico to Guatemala, at elevations from near sea level to around 2,700 meters (8,700 feet) (Webb 1980, Rossman et al. 1996, Stebbins 2003). The distribution is spotty in many areas.