104 jSmATjE 



The following analytical table will be found to contain, in ai 

 condensed form, a key to the subsequent classification of genera. 



SYNOPSIS OF FAMILIES AND GENERA. 

 Family I ; Crotalid^. Ercctible poison fangs, in front j few tect^ m 

 upper jaw ; a deep pit on side of face, between tlie eye and 

 nostril. 



Family II : CoLUBRiDiE. No pit nor poison fangs j- both jaws fully pro- 

 vided with teeth ; no anal appendages. 



FAMILY I : CROTALID^. 



rPoM '^v. o ^n++i« ( ^"^'^^^ small sca^e-like plates. .Crotaltjs. 



J.txll "Willi a. rtlltie. 1 •.•t ^ ^ 1 i 



Ton of head coverpri i ^^''^ ^^^'^^ P^^*^^ arranged as 



iop 01 neaa covertxl. . . ^ ^^ Coluber .Crotalophorus. 



Tail without a rattle Ancistrodon. 



FAMILY II : COLUBHID^. 



(_ _ ( entire. .-.-.. .-. Evtjenia. 



divided Nerodia. 



So 



CO m 

 Oj o 



Three. Postabdominal scutellse •? 



3 i 



(two Regina. 



Two. Anteorbitals. < 



( one ScoTOPKis. 



Numerous. Labials not in orbit , Heterodon. 



^^ f entire , Ophibolus. 



§ g I Divided, fLong, narrow. Lower anteorbital minute. Bascasign. 



S -g' j Vertical < t one C'hlorosoma. 



3 « I plate I Broad, short. Nasal . . < 



^^ t (. (two DiADOPHIS. 



Anteorbitais absent. Scales smooth. Celuta. 



Loral absent. Scales carinated Storeria. 



I shall now proceed to give a brief description of the genera 

 and species of serpents inhabiting New-York, with some general 

 remarks upon each. 



