COAST RANGE CORRIDOR IN CALIFORNIA 



181 



tion into populations on several mountain ranges of southern Cali- 

 fornia — San Gabriel, San Bernardino, San Jacinto, and Palomar. 



4. Two closely related species of skinks (Fig. 18) show a limited 

 sympatry in the Southern Peninsular Ranges of southern California. 

 The sympatric relationship is not so well established as for Ensatina 



GILBERTS SKINK 



SYMPATRIC— 3Si!llX z' ^ ^ 



EUMECES I 



GILBERT! / 



Fig. 18. Distribution of western skink, Eumeces skiltonianus, and 

 giant western skink, Eumeces gilberti. 



and Batrachoseps, but appears to be valid. Also, it is more difficult to 

 explain reasonably the location of the sympatry. However, the 

 sympatry of the skinks is of particular interest for the reason that 

 it is unique for closely related species of reptiles in the far west, 

 and involves a northern Madro-Tertiary component that has made 

 an end run around the northern end of the Coast Range corridor. 

 The northern species, Eumeces skiltonianus, appears to have moved 

 down the corridor along with boreal species. A few insular popula- 



