201 THE CLASSIFICATION OF THE OPHIDIA. 



I give the following synopsis of the genera so far as I have been able to examine 

 them : 



I. Hypapophyses not piercing (Esophagus. 

 * Apical calyces of hemipenis present. 

 A. Calyces with the borders spinous. 

 Spines at angles of calyces only ; colubriform ; scuta normal ; teeth longest posteriorly. 



*Acanthoealyx Cope. 

 Spines numerous, bordering the calyces ; colubriform ; scuta normal ; teeth equal. . . . Gonyosoma Wagl. 

 AA. Calyces with spines on the internal walls. 



Calyces numerous, fringed ; scuta normal ; one nasal plate f Entechinus Cope. 



AAA. The calyces, excepting the inferior marginal ones, not furnished with spines. 



a. No apical awn or papilla. 



/?. Calyces normal ; i. e,, small and deep. 



y. Hemipenis not capitate. 



<}. Calyces mingled with large pockets. 

 Isodont ; attenuate ; ventrals keeled Dendrophis Boie. 



88. Calyces without large pockets ; ventrals not keeled. 



£. Rostral normal or compressed ; pupil round. 



if . Anterior teeth not longer than posterior. 



rj. Two median rows of scales. 



Colubriform ; isodont ; anal double % Herpetodryas Boie. 



Colubriform ; isodont ; anal single § Spilotes Wagl. 



rjTj. One median row of scales. 



0. Trachea enormously expanded transversely. 

 Subisodont ; dipsadiform Ihrasops Hallow. 



00. Trachea normal. 



i. Calyces numerous, fringed. 



/.. One nasal plate. 



Isodont ; colubriform ; anal divided Oyclophis Gthr. 



Isodont ; coronelliform ; anal divided Contia B. & G. 



v./.. Two nasal plates. 



Anal divided ; no epiglottis ; attenuate LeptopJds Bell. 



Anal divided ; no epiglottis ; colubriform ; teeth longer posteriorly Zamenis Wagl. 



Anal divided ; no epiglottis ; colubriform ; teeth equal Coluber Lim. 



As Coluber, but anal entire I Compsosoma D. & B. 



As Compsosoma, but rostral prominent and compressed RhinecMs Wagl. 



As Compsosoma, but an epiglottis EpiglottopMs Copa. 



A.nal entire ; rostral prominent, produced backwards ; four prefrontals ; an epiglottis. . .Pityophis Holbr. 

 Anal entire ; plates normal ; coronelliform Osceola B. & G. 



a. Calyces numerous, not fringed. 



Attenuate ; dipsadiform ; isodont Bucephalus Smith. 



Posterior teeth longer ; coronelliform ; anal divided ; one scale-pit Goronella Laur. 



Teeth subequal ; coronelliform ; anal divided ; two scale-pits ; pupil round Proterodon Hallow. 



Colubriform ; anal divided ; inlernasal and nasal united Symphimus Cope. 



*Type Zamenis ventrimaculatus Gray. 



t Type Cyclop his major Gthr. 



\ Zaocys Cope is apparently allied to this genus, but I do not know the penial structure. 



§ Includes Herpetodryas fuscus, where the anal is sometimes divided. 



I This is Phrynonax Cope, Boulenger. Compsosoma has priority, and the penial structure is identical. 



