1886.] 489 |"Cope. 



ee. Vertebrae with narrow compressed neural spines. 

 Scale-pits double ; pupil erect ; rostral plate normal ; two prefrontals. 



Qxyrr7wpus* Wagl. 

 Rostral plate normal ; one nasal plate ; two prefrontals 



Tomodon D. & B. 

 Rostral plate separating internasals ; scale pores single ; two prefrontals. 



Trimerorhinus\ Smith. 

 38. Anal plate double. 



e. Scales smooth. 

 No scale-pits ; tail short ; rostral obtuse ; nasals two ; pupil round 



Eryt7irolamprus\ Boie. 

 One scale pit ; loreal not in orbit ; rostral obtuse ; nasals two ; pupil 



round Tachymen is Wiegem. 



Loreal entering orbit ; pupil erect ; rostral obtuse ; nasals two 



Tarbop7iis% Fleisch. 

 One nasal plate ; no scale- pits ; rostral truncate ; pupil erect 



Manolepis\ Cope. 

 ee. Scales keeled. 



Pupil erect ; anal double Dryophylax Wagl. 



vv One row of subcaudal scuta. 



Two preoculars ; head distinct • body compressed DitypopMs Gthr. 



Two preoculars ; body round ; head not distinct Hologerrhum Giinth. 



One preocular ; body round ScytaW\ Boie. 



/?/5. Rostral plate protuberant. 

 v. Rostral not recurved. 

 Loreal not entering orbit ; pupil round ; two nasal plates ; rostral mod- 



erate Conophis Pet. 



Scales not grooved ; rostral very prominent Rhamphiophis Pet. 



Scales grooved ; rostral prominent Rhagerhis Pet. 



vv, Rostral plate recurved. 



One row of subcaudal scuta Fhimophu** Cope. 



Two rows of subcaudal scutella Rhinostoma Wagl. 



COLUBRIN^E. 



A. Posterior maxillary teeth not abruptly longer than those that pre- 

 cede them. 



1. Rostral plate expanded transversely and with free lateral borders. 

 Several preoculars ; scales smooth, anal and subcaudals double 



Salvadora\\ B. & G. 



2. Rostral plate not expanded and free laterally. 

 * Two median dorsal row of scales. 



One preocular plate Herpetodryas\\ Boie. 



* Includes Brachyrhylum D. & B. f Olisthenes Cope, 



t Psammophylax (Fitz) Guuther. ** Rhinosimus D. & B. preoccupied. 



% Coniophanes Hallow. ft Preoccupied in botany, hence Phi- 

 '$ Gunther says (Catal. Brit. Mus. p. 33) molhyra Cope. 



"anal bifid." XtPhyllosira Cope. 

 J Type Tomodon nasutus Cope. 



