PROCEEDINGS 



CALIFORNIA ACADEMY OF SCIENCES 



Fourth Series 



Vol. XI, No. 6, pp. 95-98 July 30, 1921 



VI 



PRELIMINARY DIAGNOSES OF NEW SPECIES OF REP- 

 TILES FROM ISLANDS IN THE GULF OF 

 CALIFORNIA, MEXICO 



JOHN VAN DENBURGH 

 Curator of the Department of Herpetology 



JOSEPH R. SLEVIN 

 Assistant Curator of the Department of Herpetology 



The following brief characterizations of new species of liz- 

 ards and snakes are based upon specimens secured by an expe- 

 dition sent by the California Academy of Sciences to the Gulf 

 of California. Paratypes of all the lizards are at hand, but the 

 snakes are known only from single specimens. The results of 

 the expedition will be published in detail later, but it seems 

 desirable to print these diagnoses of new species without delay. 



Crotaphytus insularis, new species 



Diagnosis. — Similar to C. collaris bailey i but with head nar- 

 rower and snout much more elongate ; black collar a single band. 



Type. — California Academy of Sciences No. 49151; adult, 

 collected by Joseph R. Slevin on the east coast of Angel de la 



July 30, 1921 



