COAST RANGE CORRIDOR IN CALIFORNIA 



175 



SO to speak, made an "end run" around the north end of the Great 

 Valley and down the corridor. However, disjunct populations of 

 this and the southern subspecies, vandenhurghianus , suggest a post- 

 Pleistocene fragmentation and retreat northward. Somewhat similar 

 distribution patterns are found in the ringneck snake, Diadophis 

 amabilis, and the mountain kingsnake, Lampropeltis zonata. 



Fig. 11 



Fig. 11. Distribution of leop- 

 ard lizard, Crotaphytus wislizenii. 

 Race silus, is isolated in arid 

 southern portion of Great Valley. 



'4 



SAGEBRUSH 

 ^^ LIZARD 

 SCELOPORUS 

 GRACIOSUS 



/ V 



1 



u 



^^^^"^•:;il....VANDEN- , 

 A«V BURGHIANUSJ 



I 

 ^-1 



Fig. 12 



Fig. 12. Distribution of Scelo- 

 porns graciosus, sagebrush lizard. 

 Effect of coastal corridor on this 

 mesic species and fragmentation 

 of its range are noteworthy. 



The northern alligator lizard, Gerrhonotus cocruleus (Fig .13), and 

 the foothill alligator lizard, G. muUicarinatus (Fig. 14), probably 

 differentiated from an ancestral Mexican species. The derived 

 species present a curious contrast in distribution. The northern 

 alligator lizard appears to have made an "end run" around the Great 

 Valley and invaded the corridor part way. The coastal arm is sub- 



