I CONTENTS 



Genus Hypsiglena 104 



Genus Chilomeniscus 105 



Genus Natrix 106 



Genus Seminatrix 109 



Genus Storeria 110 



Genus Virginia 110 



Genus Amphiardis Ill 



Genus Potamophis Ill 



Genus Tropidoclonion Ill 



Genus Liodytes 112 



Genus Thamnophis 112 



Genus Coniophanes 117 



Genus Leptodeira 118 



Genus Trimorphodon 118 



Genus Tantilla 118 



Family Elapidae 119 



Genus Mierurus 119 



Family Disteiridae 120 



Genus Pelamydrus 120 



Family Crotalidae 120 



Genus Agkistrodon 120 



Genus Sistrurus 121 



Genus Crotalus 122 



Subclass Synapsida 126 



Order Testudinata 126 



Family Kinosternidae 126 



Genus Sternotherus 126 



Genus Kinosternon 127 



Family Chelydridae 128 



Genus Maerochelys 128 



Genus Chelydra 128 



Family Testudinidae 129 



Genus Clemmys 129 



Genus Emys 130 



Genus Terrapene 130 



Genus Malaclemys 131 



Genus Graptemys 132 



Genus Chrysemys 133 



Genus Pseudemys 135 



Genus Deiroehelys 137 



Genus Gopherus 137 



Family Cheloniidae 138 



Genus Chelonia 138 



Genus Eretmochelys 138 



Genus Caretta 139 



Family Dermochelidae 139 



Genus Dermochelys 139 



Family Trionychidae 140 



Genus Amyda 140 



