12. SCELOPORUS 341 



dorsal and dorso-lateral longitudinal light stripes, and in 

 lacking the parallel dark lines which are present on the 

 lateral scales of that species. S. magister lacks the mid- 

 dorsal light stripe of S. rufidorsum, and often has a broad 

 dark brown dorsal band not found in the present species. 

 I have been unable to find any differences in squamation, 

 but the femoral pores average fewer( 16.56) than in S. 

 zosteromus (18.46) and more than in S. magister (12.61). 

 Many of the specimens are as large as the largest S. magister. 

 Dr. Yarrow, in the original description, stated that the type 

 came from San Quentin Bay, California, meaning Lower 

 California. At the same time he recorded other specimens 

 from Cerros Island and from La Paz. Those from the last 

 locality are, of course, S. zosteromus. A year later Yarrow 

 recorded all these specimens as from La Paz, but there is 

 no doubt that the specimens were collected where first 

 stated. 



Distribution. This lizard is known from the western 

 part of Lower California from latitude 32 degrees to 30 

 degrees, where it has been taken at Ensenada, San Jose, San 

 Telmo, foothills of San Pedro Martin Mountain, Matomi, 

 San Fernando, San Rafael, Socorro, Rosarito, San Quintin, 

 San Quintin Bay, and Cerros Island. Specimens from San 

 Ignacio and Mulege, recorded by Mocquard, may belong 

 to this species rather than to S. zosteromus. I have examined 

 specimens from Las Animas Bay, San Nicolas Bay and 

 Puerto Escondido, on the eastern coast of the peninsula. 



