8 



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

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



SYNOPSIS OF FAMILIES AND GENERA. 

 Family I : Crotalid^. Erectible poison fangs, in front ; few teeth in 

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

 nostril. 



Family II : CoLUBRiD^. No pit nor poison fangs ; both jaws fully pro- 

 vided with teeth ; no anal appendages. 



FAMILY I : CKOTALIDJG. 



rvnu •*-!» o ,.nf+i« ( "^v^t^^ small scale-like plates. .Crotaltjs. 



Top of head covered. . . ) ^" J ^^rp plates arranged as 



^ (in Coluber Orotalophohus. 



Tail without a rattle Ancistrodo s . 



FAMILY II : COLUBRID^. 





o 



tn 



< 



o 



PI 

 c3 



m 

 ->! 



EH 



M 



n 

 o 



H 



i* 



< 



'c, O 



dJ o 



Three. Postabdominal scutellje 



entire EuTjEnia. 



divided Nekodia. 



Two. Anteorbitals. 



^ two Regina. 



( one ScoTOPHis. 



Numerous. Labials not in orbit Heterodon. 



^ ^ /"entire Ophibolus. 



Divided. (Long, narrow. Lower anteorbital minute. Bascanion. 



11 



SI 



Vertical i Cone Culorosojia. 



plate ( Broad, short. Nasal . . } 



f two DiADOPHIS. 



Anteorbitals absent. Scales smooth Celcta. 



Loral absent. Scales carinated Storeria. 



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

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

 jremarks upon each. 



