LIZARDS. 217 



The Proctotrete. Proctotretus multimaculatus, Dum. et 

 Bib. E. G. iv. 290. BelL ZooL Beagle, 17, U 9,/. 1. 



Grey, with crowded black dots ; ears very small, simple ; sides 

 of the neck and hinder part of the thighs completely granular ; 

 scales of the back small, numerous, lozenge-shaped, distinctly 

 keeled, not dagger-pointed ; of the sides smooth ; of the throat and 

 belly entire. 



a — c. Adult and young, in spirits. Bahia Blanca, Patagonia. 

 Presented by Charles Darwin, Esq. 



c. Femoral and anal yores none. 



\ Interparietal plate small, linear. Head-shields regular. 



35. Leiocephalus, Gray. Holotrophis, Dum. et Bib. 

 Tropidurus, part, Fitz. Pristinotus, Gravenh. 



Head pyramidical, quadrangular. Nostrils lateral, upon the 

 face-ridge. Head-shields moderate, angular, oblong, nearly equal, 

 with a small interparietal and transverse supraocular shields, and 

 4 frontal shields between the eyes. Palate toothed. Ears toothed 

 in front. Neck smooth below, irregularly plaited on the sides, 

 and with an oblique plait in front of each shoulder. Body and 

 tail 3-sided, covered with imbricate, keeled, sharp-pointed scales, 

 placed in oblique lines, converging towards and forming the dor- 

 sal crest. The outer edge of the 2 or 3 first hinder toes toothed. 

 Femoral and preanal pores none. 



Does not change colour nor dilate its throat ; twists its tail 

 spirally. 



* Ventral scales keeled. 



Heeminier's Koquet. Leiocephalus Herminieri. Holotro- 

 phis Herminieri, Dum. et Bib. E. G. iv. 261, t. 44. 



The dorsal crest high, compressed ; scales of the belly keeled ; 

 tail strongly compressed. 



Inhab. Martinique. Mus. Paris. 



** Ventral scales smooth, torn on the edge. 

 f Eyebrow-disk covered ivith broad shields. Leiocephalus. 



The Keeled Roquet. Leiocephalus carinatus, Gray, Phil. 

 Mag. 1837, ii. 208. 



Dorsal-crest moderate, low in front, higher on the loins and 

 base of the tail ; tail much compressed, distinctly crested ; olive, 

 sides blackish-varied ; tail dark-ringed ; muzzle with 2 pair of 

 small equal, and some smaller central scales in front of the larger 

 oblong longitudinal frontonasal pair ; scales of the nape smaller 

 than those of the back, in 15 series ; of the belly smooth, torn on 

 the edge ; head-shields smooth, the interparietal elongate, linear. 



a. In spirits. West Indies. U 



