CONTENTS IX 



Family Anniellidae "" 



Genus Anniella ^^ 



Family Helodermatidae ^"^ 



Genus Heloderma 67 



Family Xantusiidae ^^ 



Genus Xantusia "' 



Family Teiidae ^^ 



Genus Verticaria "" 



Genus Cnemidophorus 70 



Family Scincidae '^^ 



Genus Leiolopisma '* 



Genus Eumeces '^ 



Genus Neoseps "° 



Family Bipedidae '^^ 



Genus Bipes "^^ 



Family Leposternidae '8 



Genus Rhineura '° 



Suborder Serpentes "79 



Family Leptotyphlopidae 79 



Genus Leptotyphlops 79 



Genus Siagonodon '^ 



Family Boidae '" 



Genus Lichanura ' " 



Genus Charina "" 



Family Colubridae 80 



Genus Carphophis ^^ 



Genus Abastor °1 



Genus Farancia °1 



Genus Diadophis 82 



Genus Heterodon °4 



Genus Liopeltis 85 



Genus Opheodrys 85 



Genus Coluber 86 



Genus Salvadora 89 



Genus Phyllorhynchus 89 



Genus Elaphe ^^ 



Genus Drymobius ^^ 



Genus Drymarchon 93 



Genus Arizona "'* 



Genus Pituophis " 



Genus Leimadophis "" 



Genus Lampropeltis 97 



Genus Stylophis 102 



Genus Contia 10* 



Genus Cemophora 103 



Genus Rhinocheilus 103 



Genus Sonora 103 



Genus Ficimia 104 



