378 



SNAKES OF CEYLON. 



these are developed ; 4th largest and touching three or four 

 scales behind. Guneate : One between the 3rd and 4th 

 infralabials. (Fig. 71.) 



Prf 



Pr S PO/T 



« B 



A.S PS 



Cos 



Fig. 71. — Polyodontognathus cserulesoens. 



(X 2.) 



B. Costals. 



