THE CLASSIFICATION" OF THE OPHIDIA. 205 



tu. Calyces few, apical. 



Subisodont ; coronelliform : two nasals ; a loreal ; anal entire OpJiibolus B. & G. 



Isodont ; fusiform ; one nasal ; no loreal ; anal entire Stylosoma Brown. 



? f. Median and posterior teeth longer than the others. 

 Coronelliform ; pupil erect ; calyces not fringed Dianodon D. & B. 



££. Rostral plate produced or recurved. 



? . Rostral not free laterally ; pupil round. 



tj. Subcaudals one-rowed. 

 Internasals distinct ; calyces few RhinocJtilus B. & G. 



Tjyj. Subcaudals two-rowed. 



0. Internasals fused with nasals. 

 Fusiform ; isodont ; rostral depressed ; calyces fringed C'hilomeniscus Cope. 



60. Internasals not fused with nasals. 



Rostral trihedral ; internasals present ; anal entire ; calyces not fringed Oemophora Cope. 



Rostral recurved ; no internasals ; calyces numerous, fringed ; anal divided Ficimia Gray. 



Rostral not recurved ; nasals distinct from labials ; calyces numerous ; anal divided * Oeagras Cope. 



Rostral not recurved ; nasals distinct from labials ; calyces very few Conopsis Gthr. 



££ . Rostral plate free laterally ; pupil erect. 

 Colubriform ; subisodont Phyllorhynchus Stejn. 



yy. Hemipenis capitate. 



Pupil round ; rostral free laterally Salvadora B. & G. 



Pupil erect ; rostral normal Hypsiglena Cope. 



PP. Calyces basin-like, large and shallow. 

 Isodont ; colubriform ; anal divided \ C'aeoealyx Cope. 



aa. An awn-like apical papilla. 



Colubriform ; scuta normal CynopJds Gray. 



** Calyx borders represented by tufts, which arc divided into numerous papillae. 



Teeth longer posteriorly ; scuta normal ; colubriform X Tylanthera Cope. 



*** Calyces split up into separate papillae. 



A preocular and one prefrontal plate Trimetopon Cope. 



No preocular and two prefrontals Adelphicus Jan. 



II. Anterior hypapophyses piercing the walls of the oesophagus. 



a. Spines in transverse or flounced rows. 

 Calyces numerous, fringed ; scuta normal ; one nasal ; dipsadiform Dasypeltis Wagl. 



ANOPLOPHALLrN^I. 



Sulcus undivided ; surface with transverse papillose flounces ; colubriform ; anterior teeth longer. 



§ Anoplophattus Cope. 



LYCODONTINJE. 



This group is intermediate in penial character between several others. It is allied 

 to the Calamarinse through Grayia, and to the Dromicinse through Homalosoma. Pseu- 

 daspis shows resemblance in the hemipenis to the Natricina?, and Anomalodon is 



* &. frontalis Cope examined. fType Drymobius percarinatus Cope, Costa Rica. 



:tType Zamenis florulentus Geoffr., Western Asia. § Possibly this is Nymphophidium Gthr. 



