CROCODILIANR, LIZARDS, AND SNAKES. 1213 



that is restricted to it. The genera wliicli do not extend iioitli of it are 

 the lollowing: 



Batkaohia. Sekpentes. 



Chorophihtn. Carpliop/iiop.s. 



Hyla. Coluber. 



Hem idarfi/liwn. Ci/ehtpli is. 



Cryptobni nrhiis. Natrix. 



Necturus, Ophiholus. 



Sauria. Reteroilon. 



Sceloporm. ' Amistrodon. 



Eumeces. Sintrnrtis. 



Cm t a Iks. 



The two remaining districts include the hirge number of species 

 which are common to the Eastern and Austroriparian snbregions 

 enumerated under tlie latter head. The Cisallegheniau is furiiuT 

 characterized by the following: 

 Hyla andersonii Baird. 

 Rana virgatipes Cope. 

 Ophiholus rhombomaculatus Holbrook. 

 To these must be added from the Austrorii)arian list: 



Abastor erythrof/rammus Daudin. 

 The following species are peculiar to the Transalleghenian district: 

 Chondrotus microstomus Cope. 

 Spelerpes maculicandns Cope. 

 Kami areolata circnlosa Kice and Davis. 

 Carplwphiops vermis Kennicott. 

 Coluber vuljrinus Baird and Girard. 

 Ophibolus calligaster Say. 

 Hutrrnia radix Baird and Girard. 

 Euta'nia butlerii Cope. 

 Tropidocloninm lineatum Hallowell. 

 Natrix Tcirtlandii Kennicott. 

 iSistrnrus catenatus Ratlnesiiue. 

 Probably Eutmnia brachystoma Cope belongs to this district, but oidy 

 one specimen has been found. 



The following species enter this district only from the Austroriparian : 

 Natrix grahamii Baird and Girard. 

 Eutwnia proxima Say. 

 Of the species peculiar to the Transalleghenian district, Ophibolus 

 calligaster and Tropidoclonium lineatum extend into the northern limits 

 of the Texan district. 



The genera which do not range northward of the Cisallegheniau dis- 

 trict are Cnemidophorus^ I/iolepismaj and Abastor. 



