CONTENTS 



Page 



Introduction __ 1 



Class Amphibia 3 



Key to Mexican orders of Amphibia 3 



Order Gymnophiona 3 



Family Caeciliidae 3 



Key to Mexican genera of Caeciliidae 4 



Genus Dermophis 4 



Genus Gymnopis 5 



Order Caudata 6 



Key to Mexican suborders of Caudata 6 



Suborder Meantes 6 



Family Sirenidac 5 



Genus Siren 6 



Suborder Ambystomoidea 6 



Family Ambystomidae 6 



Key to Mexican genera of Ambystomidae 6 



Genus Bathysiredon 7 



Genus Siredon 7 



Genus Rhyacosiredon 8 



Genus Ambystoma 10 



Suborder Salamandroidea 14 



Family Salamandridae 14 



Key to Mexican genera of Salamandridae 14 



Genus Taricha 14 



Genus Diemictylus 15 



Suborder Plethodontoidea 16 



Family Plethodontidae 16 



Key to Mexican subfamilies of Plethodontidae 16 



Subfamily Thoriinae 16 



Genus Thorius 16 



Subfamily Plethodontinae 18 



Key to Mexican genera of Plethodontinae 18 



Genus Ensalina 19 



Genus Batrachoseps 19 



Genus Aneides 20 



Genus Parvimolge 20 



Genus Oedipina 21 



Genus Magnadigita 21 



Genus BolUoglossa 22 



Genus Pseudoeurycea 25 



Genus Chiropterotriton 30 



Order Salientia 23 



III 



