MEMOIR ON AMPHIBIA. 381 



(Coluber). Large fcales under the belly. Two rows of 

 imbricated fcales under the tail. All the teeth alike. 

 No fang or canine tooth. Harmlefs. 



(Boa). Large fcales under the belly and tail. The tail 

 without rattles. No teeth. 



Cenchris. Large fcales under the belly and tail. The 

 tail without rattles. Small equal teeth. 



Agkiftrodon. Large fcales under the belly and tail. 

 No rattles. The extremity of the upper jaw furnifhed 

 with two hollow fangs or canine teeth. Venomous. 



In this laft divifion fhould be arranged the mokafon. 



I fay nothing with refped to other genera, in which I 

 have no alteration to propofe. 



An 



