﻿34+ 3. IGUANIDM 



colored, have more evident dorsal dark spots and dorsal and 

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

 lateral lines. 



Length to anus.._ 85 92 98 103 105 106 



Length of tail 13+ 138 1+2 160 



Snout to ear 20 21 23 2+ 25 2+ 



Width of head 18 20 21 23 2+ 21 



Snout to back of 



interparietal 16 18 19 20 20 19 



Fore limb 46 +3 46 +5 +9 +8 



Hind limb -._ 71 69 78 75 79 76 



Base of fifth to end of 



fourth toe 29 2V/i 30 27 29 29 



Distribution. — Monserrate Island, Gulf of California, 

 Mexico. 



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

 teromus, S. rufidorsum, and S. lineatulus. It has a greater 

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

 (18.54, 16.56, 18.4). 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. 



