Anguidae — Lateral Fold Lizards
Species I've seen:
Elgaria — Western Alligator Lizards
Elgaria coerulea
Northern Alligator Lizard
Elgaria kingii
Madrean Alligator Lizard
Elgaria multicarinata
Southern Alligator Lizard
Ophisaurus — Glass Lizards
Ophisaurus ventralis
Eastern Glass Lizard