CLASS REPTILIA. 



C. Tail ending i?i a spine ; suhcaudal plates simple, one 

 7'owed, head with shields hehind the eyes. Tisiphone Fit%. 

 Cenchris. Daud. — Ancistodan, Pallas. 



Catesby's Tisiphone. Tisiphone Shausii, Gray. Coluber 

 Tisiphone, Shaw. Catesby Car. ij. t. 45. Peleas Niger 

 fusens, Merrem. Cenchris Mockeson, Daud, t. 60, and 

 t. 70- f- 3, 4. — See also Tisiphone Cupoea, Fitz. South 

 America. 



D. Tail ending in a spine ; suhcaudal plates double and 



single ; head with scales. Lachesis. 



L. Rhombeata. Pr. Max. Crotalus Mutus, Lin. Boa 

 Mutus, Lacep. Scytale Catenata, Licht. Lachesis Mutus, 

 Daud. Cophias Crotalinus, Merrem. Curuacea, Margr. 

 Bothrops Suruacea, Wagler. Braz. t. 23. 



E. Tail simple ; sub-caudal plates double ; head scaly. Co- 

 phias, Merrem. Crassedocephalus, Fitzenger. Bothrops, 

 Spix. Trigenocephalus, Oppel. Alecto, Megasra, Atropos, 

 and Tropidolsemus, Wagler. 



American. 



Cophias Lanceolatus. Coluber, Lacep. ij. t. 5. f. 1. Vipera, 



Daud. Col. Megaera, Shaw. Brazils. Cophias Msegera. 



Bothrops, Spix, t. 19. Cophias Furia, Boie. Bothrops, 



Spix, t. 20. Cophias Leucostigma. Bothrops, Spix, 



t. 21. f. 1. Cophias Tessalatus. Bothrops, Spix, t. 2J. 



f. 2. Cophias Taeniatus. Bothrops, Spix, t. 21. f. 3. 



Cophias Triangulum, Boie. Mus. Leyd. Vip. Brasiliana, 



Lacep. Cophias Jacaraca, Pr. Max. adult and jun. 



Col. Atrox, Pr. Max. not Merrem. Cophias Atrox, Mer- 

 rem. Col. Atrox, Linn. Mus. Adolph. j. t. 23. f. 9. Vip. 

 Atrox, Laur. , Col. Ambiguum, Weigh Vip. Weigelii, 

 Daud. Vip. Tigrina, Daud. Vipera Tigrina, Licht. 

 Cophias Neuweidii. - C. Bothrops, Spix, t. 21. f. 1.—— 



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