216 REPTILES. 



Weigmann's LeioljEmus. Leiolaemus Weigmannii. Procto- 

 tretus WeigmanDii, Dum. et Bib. E. G. iv. 284. Bell^ Zool. Bea- 

 gle, t. 8,/. 12. 



Greyish, with a fulvous streak hetween 2 series of angular 

 black spots ; a white-edged black streak on each thigh ; the head 

 rounded ; muzzle rounded, blunt; the ears moderate, granular in 

 front; nostrils rather superior ; cheek-scales 2-rowed ; back of the 

 thighs granular, with scales near the base of the tail like those of 

 the under part ; scales of the back moderate, rhomboidal, dagger- 

 pointed, keeled ; of the throat and belly entire, uot nicked ; thigh 

 granular, with a group of large scales behind. 



a, b. In spirits. Bahia Blanca. Presented by Charles Darwin, 

 Esq. 



c. In spirits. Peru. Presented by J. E. Gray, Esq. 



d. In spirits. Monte Video. Presented by C. Darwin, Esq. 



e. In spirits. Maldonado. Presented by C. Darwin, Esq. 



33. Ptygoderus. Proctotretus, part, Dum. et Bib. 



Head rather depressed, covered with equal, rhomboidal, keeled 

 plates. Throat with a fold on each side. Palate toothed. Nos- 

 trils lateral on the face-ridge. Ears sunk, toothed in front. 

 Cheek-scales l-rowed. Body with a crest of compressed scales on 

 each side. Scales of the upper parts keeled, of the belly smooth. 

 Back and tail not crested. Tail roundish, tapering. Toes sim- 

 ple. Femoral pores none. Males with pores on front of cloaca. 



The Ptygodere. Ptygoderus pectinatus. Proctotretus pecti- 

 uatus, Dum. et Bib. E. G. iv. 192. Bell, Zool. Beagle, 18, t. 9,f. 2. 



Fulvous grey, with 3 series of large white-edged black oval 

 spots, head with 3 white cross lines ; ears moderate, toothed in 

 front ; labial plates very narrow ; scales of the sides of the throat, 

 back and sides rhomboidal, keeled, imbricate. 



a — c. In spirits. Presented by Charles Darwin, Esq. 



34. Proctotretus, part, Dum. et Bib. 



Head depressed, broad, covered with numerous, very small, 

 smooth, many-sided head- shields. Interparietal plate very small, 

 surrounded with very small plates. Nostrils superior, subapical, 

 on each side, just above the face-ridge. Throat granular, and 

 with a fold on the sides. Ears sunk. Cheeks with 3 or 5 series 

 of small scales between the lip-shields and the elongated infra- 

 orbital shield. Body depressed, simple, scales rhombic, imbri- 

 cate, of the belly smooth. Back and tail not crested. Toes simple. 

 Tail elongate. Femoral and preanal pores none. Males with 

 small pores on the front edge of the cloaca. 



