Chisos Mountains and Basin, upper Green Gulch and Panther Pass. Mountain habitat where pinyon, juniper, oak, agave, sotol, yucca, and nolina dominate. Known only from three Texas counties. Collared and non-collared color phases. Secretive, rear-fanged, possibly does not surface during dry years, nocturnal, most active following heavy rainfall.
Classification is currently under study.
Parkwide but mainly Chisos Mountains and foothills. Rocks, canyons, pools, mountains, springs, tinajas. Live-bearing, nocturnal or diurnal. Floodplains, permanent water, rivers, ponds, springs, pools, streams. Semiaquatic, live bearing, nocturnal and diurnal.