CLASS REPTILIA. 



semifasciata, Merr. Col. varius, Merr. Seba.- Col. angu- 



latus, Lin. Merr. t. 9- Natrix aspera, Spix. Braz. 



Homolophis aer, Boie. Col. aer, Oppel. Col. plicatus, 



Lin. Mus. t. 6. f. 1. Bali. Lacep. Elaps plicatilis, Schn. 



Cerastes plicatilis, Laur. Col. ^neus, Spix. Horn. 



moluroides, Boie. Col. molurus, Lac. 1. 10. Horn, plumbea, 



Kuhl, Boie. Horn. Jara, Boie. Col. Jara, Shaw, Russel, 



t. 14. Col. Linnasi, Merrem. 



Genus. Boa. 

 •Ventral shields narrow ; body thick ; anal spurs distinct ; 

 nostrils opical ; subcaudal plates simple, a double tail 

 conical. 



Body compressed fusiform ; head depressed; tail prehensile ; 

 hack of the head, scaly ; subcaudal plates simple. Ame- 

 rica. Boa. 



Muzzle covered with scales ; labial scales jlat. Boa, Wagler. 

 Boa constrictor, Lin. Devin or Boa, Empereur, Daud. 



Muzzle covered with scales ; labial scales pitted. Epicrates, 

 Wagler. 



Epicrates Cenechria. Boa cenchris, Lin. Daud. Seba. Boa 

 cenchrya, Pr. Max. 



Muzzle covered with plates ; labial scales flat. Eunectes, 



Wag. 



Eunectes murina. Boa murina. Boa scytale, Linn. Seba. 



Boa anacondo, Daud. Boa aquatica, Pr. Max. Eunectus 



lateristrigota. Boa lateristriga, Boie, 



Muzzle covered with plates ; labial scales pitted. Xiphos- 

 oma, Wag. 



Xiphosoma canina. Boa canina. Lin. Boa hypnale, Lin. 



Xip. araramboya, Wag. Xiph. hortulana. Boa hortulana. 



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