344 3. 1GUANIDJE 



colored, have more evident dorsal dark spots and dorsal and 

 dorsolateral light bands, and lack the narrow, parallel, dark 

 lateral lines. 



Base of fifth to end of x 



fourth toe 29 27J^ 30 27 29 29 



Distribution. Monserrate Island, Gulf of California, 

 Mexico. 



Remarks. This large lizard is closely related to S. zos- 

 teromuSy S. rufidorsum y and S. lineatulus. It has a greater 

 average of femoral pores (19.7) than any of those species, 

 ( 1 8.54, 1 6.56, 1 8.4). Adult males have a dorsal light band 

 as in S. rufidorsum, but resemble the other two species in 

 the absence of a dorsolateral light band and the presence of 

 parallel dark lines on the lateral scales. It differs from 

 all three of the other species in the bluish gray coloring on 

 the back and sides. 



Habits. This lizard is fairly common on the ground 

 in the brushy dry washes. One was found out at night while 

 hunting with a lantern. 



