CLASS REPTILIA. 



II. Upper jaw toothed, fangs none, or small. 



Cen. 3. CoLUBEE. 



Ventral shields broad, anal spurs none, tail, usually conical, 

 and elongate. 



^. Body subcylindrical, scales equal, suhcaudal plates, 

 double or single, head moderate, above shielded. 



a. Head regularly shielded, nose acute, recurved. Heterodon. 



Coluber constrictor, Lin. (Ed. 10.) Boa contortrix, Lin. 

 (Ed. 12.) Col. Heterodon, Daud. Heterodon platyrhincus, 



Latr. Boa porearia, Lacep. Catesby, 7* t. 5Q. Heterodon 



simus. Col. simus, Lin. Merrem. 96. Col. borealis, Schoeff. 



Heterodon nasua, Vipera nasua, Oppel. Rhinostoma 



flasua, Wagler. Rhinostoma proboscideura, Fitz. 



h. Head regularly shielded, nose rounded. Coluber. 



A. Head distinct, oblong, ovate before, slightly truncated, 

 gape, very wide, body long, cylindrical, tail half as long 

 as the body, continued, acute, scales imbricate lanceolate, 

 mostly keeled, placed in longitudinal series, abdominal 

 shields, simple, arched. Tropidonotus, Kuhl. 



European. 



Trepidomurus natrix. Col. natrix, Lin. Col. murorum. 



Col. mur. Fitz Col. Oppelii, Dumeril. C. Murorum, 



Mus. Col. Viperinus, Daud. Latr. Col. pseudo echidna, 



Herm. Col. hybridus, Merrem. Tr. scaber, Boie. 



Col. scaber, Lin. Mus. Adolph. 1. 10, f. 1. Dacypeltis scaber, 

 Wagler. 



Asiatic. 



Tr. melanozostus, Gravenh. Iris, 182G, 206. Tn 



funebos, Oppel. Tr. chrysar^us, Kulil. Trop. sub- 



85 



