REPTILES. 605 



jaw with poisonous fangs ; IiacJc part of tlie head tuinid, and witli scales the 

 same as on tlie back ; under tlie tip of the tail are double plates, and termi- 

 nated by a pointed spur. 



Genus 23.— LA'SG AU A.~Bntgutcre. 



Generic Character. — Head with seven large plates, and a central one be- 

 tween the eyes ; muzzle l<ing and acute ; upper jaw greatly longer than the 

 under one, with poisonous fangs ; body covered above anteriorly with small 

 scales, and having plates behind the vent surrounding the tail, which to- 

 wards its tip is provided with small scales. 



Ge?M«24.— TRIGONOCEPHALUS.— OjBjoe/. 



Generic Character — Head broad behind, and in some species covered with 

 scales like those of the back, in others tliey are granulated ; with depres. 

 sions behind the nostrils ; upper jaw with poisonous fangs ; tail frequently 

 terminated by a small horny spur. 



Ge/ms 20.— VLATURVS.—Latreil/e. 



Generic Character. — Head covered with large plates ; upper jaw with 

 poisonous fangs ; tail compressed, provided willi two rows of plates, ternii. 

 uated by two large ones. 



Genus 2G. — NAIA. — Laurenti. 



' Generic Character. — Plates of the head larger than those of the body ; 

 those on the body longest near the head ; occiput furnished with a hood ; 

 upper jaw with poisonous fangs. 



Naiavuli;aris. — The Spectacle Snake. Plato Ix v. fig. I. Describeri, V(d. 

 iv. p. ISl. 



Genus 2":.— Eh AVS.— Schneider. 



Generic Character. — Head with large plates ; jaws provided with poison 

 fangs, capable of but little dilation; head behind of same breadth as the 

 neck. 



Genus 28.— COBRA Laurenti. 



Generic Character. — Head from behind the eyes to the mouth, sub. trian- 

 gular with carinated scales ; upper jaw with poisonous fangs. 



Geitus 29.— VIPERA.— Cwner. 



Generic Character. — Head with granulated scales; upper jaw with poi- 

 sonous fangs ; plates under the tail sub-divided. 



TRIBE III. — NAKED SERPENTS. 



Genus 30.—CJEClLlA.—Linna:us. 



Generic Character. — Body cyliiuirical; skin not protected by scales, but 

 having longitudinal folds ; eyes extremely small. 



Cincilia glutinosa.— The White-Sided Cascilia. Plate Ixv fig. 2. Head 

 long and tumid ; nostrils wide ; deep brown, with a white longitudinal 

 stripe on each side, disposed so a> t i form a slight carina. Twelve inches 

 long. Inhabits South America. 



