194 3. IGUANIDM 



surface of boulders. They are shy and move swiftly. They 

 sometimes jump from boulder to boulder, but usually re- 

 treat to some crevice. Like many other lizards, they are 

 said to be less active during the hotter hours of the day. 



34. Uta slevini, new species 

 ANGEL ISLAND GIANT UTA 



Description. Head considerably depressed, snout elon- 

 gate, very low. Canthus rostralis well-marked. Nostrils 

 large, opening almost upward in rounded plates, much 

 nearer to end of snout than to orbit. Plates on head large, 

 smooth, and but slightly convex ; interparietal largest. 

 Frontal plate usually divided transversely. Two or three 

 posterior series of supraoculars enlarged, separated from 

 f rentals by one or two series of granules. Superciliaries long 

 and imbricate. A long, narrow, strongly-keeled subocular, 

 followed and preceded by similar but smaller plates. Ros- 

 tral very wide and low, as also the five to seven supralabials. 

 Symphyseal plate large and followed by several large chin- 

 shields. First infralabials much larger than others. Sub- 

 iabials long and narrow. Skin on gular region covered with 

 small, smooth, rounded granules, slightly largest centrally 

 and near edge of strong gular fold. A dermal fold on each 

 side between limbs. Back and sides covered with smooth, 

 convex, rounded granules, largest medially, smallest later- 

 ally, and changing gradually to small, smooth, slightly im- 

 bricate scales on belly. Tail and anterior and upper sur- 

 faces of limbs bearing larger imbricate scales each provided 

 with a strong keel ending in a projecting spine. Seventeen 

 to 23 pores forming a series along each thigh; average in 78 

 thighs, 21.4. Males with enlarged postanal plates. 



The color above is bluish gray or olive, often strongly 

 tinged with brown, and crossed by irregularly undulate bands 



