1896.] Distribution of Batrachia and Reptilia. 1017 
VII. THe WESTERN SUBREGION. 
This subregion presents two distinct modifications, a north- 
ern and a southern. The boundary between the two has not 
yet been defined ; it represents the demarkation between the 
greater humidity of the north and the arid conditions of the 
south. The name of Diegan has been given by Mr. Van Den- 
berg to the southern region; to the northern I propose to re- 
strict the name Pacific, which I formerly used for the entire 
subregion, which had been previously named the Western by 
Baird. The Pacific district extends further south along the 
Sierra Nevada than in the San Joaquin Valley. Some of the 
forms of the Diegan district extend north to the latitude of San 
Francisco, but the majority of the species are restricted to more 
southern latitudes. How far the Diegan district extends on the 
Lower Californian Peninsula is uncertain. The separation from 
the Chihuahuan district is also undertermined, and the species 
of both districts mingle in some degree on their borders. 
Species peculiar to the Diegan district are the following: 
BATRACHIA: Zablepsis henshavii Stejne- 
Bufo columbiensis halophila eink 
B&G Amebopsis gilbertii Van 
Denburg. 
SAURIA : Verticaria sericea Van Den- 
berg. 
Uta repens Van Denberg. 
Uta mearnsii Stejneger. 
Sceloporus orcuttii Stejne- 
Cnemidophorus tessellatus 
multiscutatus Cope. 
Cnemidophorus tessellatus 
pas vandenbergianus ent CODE: 
i A Anniella pulchra Gray. 
Phrynosoma cerroënse Stej- 
neger. SERPENTES : 
Anota goodei Stejneger. Lichanura orcuttii Stejn. 
Xantusia vigilis Bd. Diadophis amabilis amabilis 
Xantusia riversiana Cope. B. & G: 
Xantusia picta Cope. Crotalus ruber Cope. 
