1886.] 4. ' » [Cope. 



v. Scales of vertebral row equal. 



Rostral plate normal ; two nasals Diemenia* Gray. 



Rostral plate narrow ; produced backwards above ; two nasals 



Pseudonaja Gthr. 



Rostral wide, prominent, depressed ; one nasal Furina\ D. & B. 



Rostral normal ; one nasal ; anal double CacophisX Gtbr. 



yy. Scales of vertebral line enlarged. 



Scales smootb Megmrophis§ Gray. 



aa. Neck extensible, covered witb more numerous scales. 

 j3. Anal entire ; subcaudals two-rowed. 



No postparietal plates >Naja\ Laur. 



Postparietals present. OphiypJiagus Gthr. 



III. No solid maxillary teeth. 

 a. Subcaudal scuta in two rows, 

 jg. Rostral plate much developed. 



Rostral free at the sides ; scales keeled Cyrtophis Sund. 



Rostral not free ; scales smooth ; anal entire Aspidelnps Fitz. 



Rostral not free ; anal entire ; two nasals Rhinelaps Gthr. 



fjp. Rostral not enlarged. 



Scales keeled Sepedon Merr. 



Scales smooth Callophis Gr. 



aa. Subcaudal scutella in one row. 

 One nasal ; a spine at end of tail AcanthopJiis Daucl. 



ELAPID.E. 



a. Internasal plate touching the nasal laterally. 



One nasal plate Vermicella'H Gray. 



Two nasal plates Elaps Schn. 



aa. Internasal reaching first labial plate. 

 One nasal ; no loreal Microsome, Jan. 



DENDRASPIDID.E. 



No solid teeth behind fang ; anal and subcaudal plates divided ; scales 

 smooth Dendraspis** Schl. 



SOLENOGLYPHA. 



CAUSID.E. 



Subcaudals double, anal entire ; scales keeled : rostral prominent, with 

 recurved border Heterophis Pet. 



*P*eridoeIaps D. &B. Elapsoidea Bocage. HemibimgarusPet.; includes Brachy- 

 soma trisle Gthr. 

 t Rrachyurophis Gthr. 



i Brachysoma Gthr. Boulengerina Dollo. 

 § Xenurelaps Gthr. 

 | Tomi/ris Eichw. 



r Homorelhps Jan. Poecilophis Gthr. 

 ** Dinophis Hallow. 



