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v.— THE AUSTRORIPARIAN REGION. 



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V". Ilcptilcs whoso distribution corresponds with the arcd of the 

 Austroriparian region — 21 : 



Siren laeertina. 



Trachjjutomatu, 



Anum. 



Engystoma carolineuse. 

 Acris gryUus gryllus. 

 llyla squirella. 

 Ilyla carolinensis. 



Ophidia. 



Caudisona miliaria. 

 Ancistrodon piscivorus. 

 Elaps fulvius. 

 Ualdea striatula. 

 Farancia abacura. 

 Cemophora coccinea. 

 Ophibolus doliatus cocciueus. 

 Coluber obsoletus confinls. 

 Coluber guttatus. 

 Tropidonotus fasciatus. 



Lacertilia. 



Oligosoma laterale. 



Cnemidophorus sexlineatus sexlineatus. 



Opheosaurus ventralis. 



Anolis principalis. 



Tcstiidinata. 



Macrochelys laeertina (except Atlantic slope). 

 Pseudemys mobiliensis (except Atlantic slope). 

 Pseudemys concinna. 

 Testudo Carolina. 



Crocodilia. 



Alligator mississippiensis. 



As aleady remarked, this fauna is composed of the Floridan, Louis- 

 iauian, and Texan districts. 



