8. CALLISAURUS 151 



Several subocular plates, middle one very long and strongly 

 keeled. Superciliaries rather small, but strongly imbricate. 

 Eyelids bearings a well developed fringe. Supralabials 

 strongly imbricate, and produced laterally so as to form a 

 series of curves when seen from above. Infralabials small, 

 juxtaposed. Below them, several series of flat sublabial 

 plates. Gulars granular and smooth, growing larger and 

 imbricate on posterior fold. Back and sides covered with 

 small flattened granules, which change gradually into much 

 larger smooth ventrals. A dermal fold usually extending 

 along each side between limbs. Tail of moderate length, 

 much flattened, its scales slightly imbricate, and along its 

 edge, pointed. Limbs very long and slender. Ear-opening 

 large, without denticulation. Femoral pores varying from 

 16 to 22; average in 75 thighs, 18.4. 



The general color above is grayish, dotted and spotted 

 with white or pale gray, and often with indications of dark 

 brown dorsal blotches which are most distinct in females 

 and young. The top of the head is rich cream or olive, 

 clouded with dark slaty gray. The upper surfaces of the 

 limbs are crossed by more or less obsolete bands of gray, 

 dark brown or blackish slate. A dark stripe, bordered above 

 and below with white, runs along the back of the thigh. 

 The upper surface of the tail is gray or light brown, with 

 cross-bars of dark brown in females and young, of brown 

 proximally and black or blackish brown distally in males. 

 The posterior borders of these bars are nearly straight or 

 but little undulate, at least from the middle to the end of 

 the tail. The throat is white, more or less clouded with 

 gray. The lower surface of the tail is white with about six 

 (five to nine) cross-bars of intense black. The belly is 

 whitish. Males have a large blue patch, marked with two 

 oblique wedge-shaped blackish blotches, on each side. These 

 blotches are obsolete, and ill-defined, are not sharply con- 



