4 CALIFORNIA ACADEMY OF SCIENCES [Proc. 3D Ser. 



Little can be stated about the faunal relationships of the 

 various islands beyond the fact that all except, probably, the 

 Farallons are clearly Sonoran. Of the island reptiles, only 

 fourteen are not known to live on the mainland. These are 



Autodax lugubris farallonensis, Phrynosoma cerroense, 



Batrachoseps pacificus, Xantusia riversiana, 



Uta martinensis, Cnemidophorus multiscutatus, 



Uta stellata, Cnemidophorus labialis, 



Uta auriculata, Bascanion anthonyi, 



Uta clarionensis, Bascanion laterale fuliginosum, 



Sceloporus becki, Crotalus exsul. 



Although the evidence is thus too meager to enable one to 

 speak positively, it would seem that the probable faunal rela- 

 tionship is about as follows : 



Transition Zone. 

 Pacific Fauna: 

 Farallon Islands. 



Upper Austral Zone. 

 Calif or nian Fauna: 



San Miguel, Santa Rosa, Santa Cruz, Ana Capa. 



San Diegan Fauna: 



San Nicolas, Santa Barbara, Santa Catalina, San 



Clemente. 

 Los Coronados, San Martin. 

 J'erhaps San Benito, Cerros, Natividad. 



Lower Austral Zone. 



Perhaps San Benito, Cerros, Natividad. 

 Magdalena, Santa Margarita. 

 Socorro, Clarion. 



South Farallon Island. 



No reptiles have been found on the Farallon Islands and 

 it is probable that none occur there. The amphibians are 

 represented on South Farallon Island by a salamander which 

 has been regarded as identical with Autodax lugubris Hal- 

 lowell. Specimens from this island, however, are much 



