CROCODILIANS, LIZARDS, AND SNAKES. 1117 



aa. Not spinous below calyces. 



Heniipenis bifurciite; calyces fringed ; auterior ribs elongate; erectile. 



' Xaja Lanienti. 

 III. Apex papillose. 



Hemipenis simple; urosteges one-rowed ; rostral iwriunl. . HoiJlocejjhalus Cuvier. 



Causiis and Atractaspu are not referred to here, as I showed in 18G0 

 that they are true Solenogiypha. 



I now give a synopsis of the genera of Najida; as defined without 

 penial characters. 



I. Grooved teeth behind two perforated teeth on the os maxillare. Head shields 



normal; noloreal; scales smooth; form fusiform (h/inodon Peters.' 



II. Solid teeth behind the fang on the os maxillare. 

 A. Loreal plate present. 



Subcaudals entire; scales smooth Deiiisuiiia Krdlt. 



AA. Loreal plate absent. 



a. The neck with few scales, not extensible. 

 p. Sabcaudal scuta one-rowed. 



y. Scales of vertebral row equal to others. 



Nasals two; scales smooth; anal bifid Pseudechis Wagler 



One nasal; scales smooth; anal single. ..Uoplocephaliis Cuvier.- 



One nasal ; scales keeled ; anal single Tropidechis Gunther. 



cxa. Scales of vertebral line enlarged. 



Scales smooth; two nasals; anal entire ZJKH(/a»-(t« Daudiu. 



/5/i. Subcaudal scuta two-rowed. 



y. Scales of vertebral row equal. 



Rostral plate normal ; two nasals Diemenia Gray.' 



Rostral plate narrow ; produced backward above ; two nasals . 



Pseudonaja Giinther. 

 Rostral wide, prominent, depressed; one nasal 



Farina Dumeril and Bibron.' 



Rostral normal; one nasal; anal double Cacophis Giinther."' 



yy. Scales of vertebral line enlarged. 



Scales smooth - Me(j<rroph is Gray .« 



era. Neck extensible, covered with more numerous scales. 

 (5. Anal entire; fsubcaudals two-rowed. 



No postparietal plates .' Xaja Laurenti.'^ 



Postparietals present Ophiophagus Giiuther. 



III. No solid maxillary teeth. 



a. Subcaudal scufa in two rows. 



/i. Rostral i)late much developed. 



Rostral free at the sides ; scales keeled Cyrtophis Smith. 



Rostral not free ; seales smooth ; anal entire AspideUips Fitzinger. 



Rostral uot free ; anal entire ; two nasals Jihinelajis Giinther. 



/i/i. Rostral uot enlarged. 



Scales keeled Se2)edon Merrem. 



Scales smooth Callojihis Giinther. 



aa. Subcaudal scutelhe in one row. 



One nasal ; a spine at end of tail Jcanthoplm Daudin. 



' Labionaris Broccbi. 

 ^ A lecto Wagler. 



^Pseudoelaps Dumeril and Bibron. Elapsoidea Bocage. Hemihunf/anis Peters; 

 includes Brack ysoma trit<tc Giinther. 



* Brachyurophis Giinther. '• Xcnurelai»f Giinther. 



'■ Lrachyaoma Giinther. Boulcngcriua Dollo. ' Tomyria Eichwald. 



