552 PROCEEDINGS OF THE ACADEMY OF [Aug., 



by the Upper and Lower Austral, each divided into a Humid district 

 beginning at the Atlantic coast and merging insensibly into an Arid on 

 the plains west of the iMississippi. The boundaries of his humid or 

 AUistroriparian division of the Lower Austral agree in the main with 

 Cope's Austroriparian subregion, and the arid division, which he termed 

 the Lower Sonoran, with Cope's Chihuahuan. 



In Cope's view^ the distribution of reptiles does not accord with the 

 arrangement proposed by Merriam, for the reason that both in the 

 east and the west, relationships in this class are much closer from 

 south to north, than horizontally. 



In the following examination, the term Austroriparian is used to 

 denote the subregion so named by Cope, minus his Texan district. 

 For present purposes I include in it his Floridan subregion. Sonoran 

 is also used in Cope's sense. 



I am able to find reliable records of the occurrence of one hundred and 

 sixteen^" species and subspecies of reptiles within the State of Texas, and 

 by plotting all the localities of their collection known to me, upon a 

 map, they arrange themselves into the following categories: 



I. — Sonoran species, which appear to range little, if at all, east of 

 longitude 96° in Texas : 

 A . — Chihuahuan :" 



Cinosternum flavescens Sceloporus variabilis 

 Testudo berlandieri scalar is 



Chrysemys ornata Phrynosoma cornutum C. 

 Crotaphytus collaris C.B. modestum 



wislizeni B. Euhlepharis variegatus 



Holbrookia texana Heloderma suspectum 



macidata C. Cnemidophorus tessellaius B.P. 

 Utastansburiana'B. . perplexus 



ornata gularis 



Sceloporus torquatus poinsetti Gerrhonotus liocephalus 



yarrov i Barissia imbricata 



ornatu s Eumeces guttidatus 

 spinosiis clarkii obsoletus C. 



consobrinus C. Anniella texaiia 



couchi^^ Glauconia dulcis 



«?. c.p. 1205 

 '' '" Macrochelys lacertina, Chelyclra serpentina and Eutcenia radix doubtless enter 

 Texas, but I have no exact localities, and they are omitted here. 



" The letters C. E. B. P. indicate that the species also enters the districts 

 known respectively as Central, Eastern, Basin and Pacific. 



" Taken at Devil's river, Tex., in 1903, by Prof. H. A. Pilsbry. 



