364 



CLASSIFICATION OF REPTILES. 



Coluber Linn. ( g. 118.) Body sub-cylindrical ; scales 

 equal; nose rounded; head moderate, with plates on the 

 crown, those beneath the tail either single or double. 



C. natrix Linn. Nasicornis. {fig. 118.) 



Heterodon. {Jig. 1 190 General structure of the last, but 

 the nose is acute and recurved. 



119 



H. platyrhinchus Lat. Constrictor. ( fig. 119.) 



Spiletes Wag. Tail half the length of the body ; 

 scales placed in longitudinal series, generally smooth ; 

 abdominal plates recurved and angulated ; head dis- 

 tinct ; mouth very small. 



S. punctatus. (Coluber punctatus Linn.^ 



Xenodon Boie. Tail short, not half the length of the 

 body, which is thick and fusiform ; head large, dis- 

 tinct, depressed ; mouth very wide ; nostrils large, 

 open ; scales equal, placed in oblique transverse series, 

 severus. Seba, i. pi. 85. fig. 1. 



