Pale gray to brown, reddish-brown, or almost black with pale oblong blotches. Usually a dark post-ocular stripe. Greenish-yellow mouth lining. Tail often banded. Can run on hind legs for short distances.
Males have femoral and preanal pores.
In rocky deserts to coastal forests. Remain in deep burrows during the heat of the day. Lays clutches of up to 30 eggs.