CALIFORNIA ACADEMY OF SCIENCES 



[Proc. 4th Seh. 



and the northern portions of the San Joaquin. The difference 

 between these two curves points to the necessity of recognizing 

 two subspecies here, a coast race, P. catenifer catenifer, and an 

 interior race, P. catenifer heermanni. 



The third, fourth, fifth, and sixth curves charted in this 

 figure 3 represent respectively snakes (3) from the San Diegan 

 Fauna, (4) from the desert regions of CaHfornia, the southern 

 San Joaquin Valley and Nevada, (5) from Utah, and (6) 



fo f-t- 'ff 



Fig. 3 



from Arizona. Curve 3 shows that the snakes from the coast 

 of southern California have more blotches than those of any of 

 the other regions where the gastrosteges are numerous. In this 

 respect these snakes are like those from the northern coast, P. 

 catenifer catenifer, from which, however, they differ in other 

 respects. The difference betw'een these snakes and those repre- 

 sented by the other curves necessitates recognition as a distinct 

 subspecies, P. catenifer anncctens, using this name in a re- 

 stricted sense. 



