412 3. IGUANID^ 



are smaller scales and granules. Two rows of peripheral 

 spines, lower series shorter than upper, and composed of 

 much smaller spines. Tail bordered with a single row of 

 lateral spines, and having a small group of slender ones 

 just behind thigh. Scales on anterior surfaces of limbs 

 large, pointed and strongly keeled, those on chest, belly, 

 and proximal part of the tail smooth or keeled. Tympanum 

 not covered with scales. Long series of femoral pores 

 present. 



The upper surfaces are variously tinted with yellow, 

 brown, and gray. A large brown patch occupies each side 

 of the neck. On the back are undulate cross-bands or large 

 blotches of dark brown, often edged posteriorly with white 

 or light gray. Similar markings may be seen on the tail. 

 The keels of many of the large dorsal tubercles are dark 

 brown. There usually is a light middorsal line. The head 

 is yellowish with more or less definite dark brown cross- 

 bars. These usually are three or four in number; one near 

 the nostrils, one on the frontal region, one between the post- 

 ocular spines and one in front of the occipital horns. A 

 dark bar runs from the eye to the temporal horns, and 

 usually another is present between the eye and lip. A third 

 anterior bar sometimes is evident. Its larger spines are 

 sometimes reddish-brown. The lower surfaces are yellow 

 or yellowish white, uniform or spotted with slate or gray. 

 All markings are usually more distinct in young than in old 

 specimens, but are very variable in both. 



