210 THE CLASSIFICATION OF THE OPIIIDIA. 



Najidae. 



I. Apex of heinipenis smooth, with ruched free margin. (Disciferi.) 



No solid maxillary teeth ; suhcandals one-rowed ; hemipenis bifurcate Acanthophis Daud. 



II. Apex with calyces. (Calyculati.) 

 a. Spinous below calyces. 



Subcaudals one-rowed ; vertebral row enlarged ; hemipenis not divided Bungarus Daud. 



Subcaudals two-rowed ; vertebral row not enlarged ; poison gland far posterior to head ; hemipenis not 



divided ; no solid teeth Adeniophis Meyer. 



Hemipenis divided ; calyces not fringed ; no flounces ; subcaudals two-rowed ; no solid teeth. 



Bepedon Merr. 



Hemipenis divided, the brauches extensively flounced below calyces ; solid teeth Ophiophagus Gthr. 



aa. Not spinous below calyces. 



Hemipenis bifurcate ; calyces fringed ; anterior ribs elongate, erectile Naja Laur. 



Hemipenis bifurcate ; anterior ribs not elongate or erectile ; solid teeth *Diemenia Gray. 



III. Apex papillose. 



Hemipenis simple ; urosteges one-rowed ; rostral normal ; solid teeth IToplocephalus Cuv. 



Dendraspididfe. 



The single genus of this family is characterized as follows : 



Sulcus bifurcate ; hemipenis simple ; calyculate, becoming spinous at middle ; no teeth behind fang ; 

 attenuate \Dendraspis Schl. 



Elapidie. 



The only genera of this family which I have examined are Elaps and Vermicella. 

 The hemipenis is alike in both, i. e., it is bifurcate, with each half with a spinous apex. 

 The extension of the spines downwards differs with the species. Thus they extend 

 but a short way in JElcq)s corallinus, but extend far down in M surinamemis and E. 

 imperator (see Pis. XXXI, XXXII). 



PLATYCERCA. 



But one family, the Hydropllida?, is included in this division. I have been able 

 to examine but two genera, Hydras and Hydrophis. Specimens of Platurus at my 

 disposal are all females. 



Hemipenis undivided ; spinous to near apex, where it is papillose Hydroplm Daud. 



Hemipenis undivided, spinous to apex ffydrus Shaw. 



SOLENOGLYPHA. 



The families of the Solenoglypha are the following : 



Maxillary bone not excavated ; fang not grooved in front ; no postfrontal bone Atractaspididm Gthr. 



Maxillary bone not excavated ; fang grooved in front ; a postfrontal Causidm Cope. 



Maxillary bone not excavated ; fang not grooved ; a postfrontal Viperidm Gray. 



Maxillary bone excavated by a large chamber ; fang not grooved in front ; a postfrontal . Urotalidce Gray. 



* Only species examined, D. annulala, (Naja) Buch. and Peters, West Africa. \ D. jamesonii Traill. 



