Lizards, Sauria Rubund Creative Commons Attribution ShareAlike.	Snakes, Serpentes Silvain de Munck via Flickr, Creative Commons Attribution-NoDerivs.
Amphisbaenia "Enterrandose" by Montuno via Flickr, Creative Commons Attribution ShareAlike.

Taxonomy:

Lizards, Sauria

Diploglossa

Fam. Anguidae

Fam. American legless lizard, Anniellidae (Add)
Fam. Xenosauridae

Gekkota

Fam. Carphodactylidae
Fam. Diplodactylidae
Fam. Eublepharinae, Eublepharidae
Fam. Gecko, Gekkonidae

Fam. Pygopodidae

Iguania

Fam. Agamidae

Fam. Chameleon, Chamaeleonidae

Fam. Corytophanidae
Fam. Crotaphytidae
Fam. Hoplocercidae
Fam. Iguanidae

Fam. Leiocephalidae (Add)
Fam. Leiosauridae (Add)
Fam. Liolaemidae (Add)
Fam. Opluridae

Fam. Phrynosomatidae

Fam. Polychrotidae

Fam. Tropiduridae

Platynota

Fam. Heloderma, Helodermatidae

Fam. Earless monitor lizard, Lanthanotidae (Add)
Fam. Necrosauridae (Add)
Fam. Varanidae

Scincomorpha

Fam. Cordylidae

Fam. Gerrhosauridae
Fam. Gymnophthalmidae (Add)
Fam. Lacertidae

Fam. Skink, Scincidae

Fam. Teiidae

Fam. Night lizard, Xantusiidae

Snakes, Serpentes

Alethinophidia (Add)

Fam. Acrochordidae (Add)
Fam. Aniliidae (Add)
Fam. Anomochilidae (Add)
Fam. Boidae

Fam. Bolyeriidae (Add)
Caenophidia (Add)

Fam. Atractaspididae (Add)
Fam. Colubrid, Colubridae

Fam. Elapidae

Fam. Viperidae

Fam. Cylindrophiidae (Add)
Fam. Lamprophiidae
Fam. Loxocemidae (Add)
Fam. Pythonidae

Fam. Tropidophiidae (Add)
Fam. Uropeltidae (Add)
Fam. Xenopeltidae (Add)

Scolecophidia (Add)

Fam. Anomalepididae (Add)
Fam. Leptotyphlopidae (Add)
Fam. Typhlopidae

Amphisbaenia

Fam. Amphisbaenidae (Add)
Fam. Bipedidae (Add)
Fam. Rhineuridae (Add)
Fam. Trogonophidae (Add)