100 



SNAKES OF CEYLON. 



frontal ; about as broad as the frontal along a line connecting 

 the centres of the eyes. Nasals : Divided. Loreal : One ; 

 about two-thirds the length of the nasals. Prasocular: 

 One. Postoculars : Three. Temporals : Two ; the lower 

 about as long as the supraocular. Supralabials : Nine ; 

 the 1st and 2nd touch the nasals ; 4th and 5th the eye, and 

 the 7th and 8th the lower temporals. Sublinguals : Two 

 pairs ; the posterior longer, and in contact with the 5th, 6th, 

 and 7th infralabials. Infraldbials : Seven ; the 7th about 

 as broad as the posterior sublinguals, but shorter ; in contact 

 "with three scales behind. (Fig. 22.) 



X Y[ lOL 



•nr K 



T YL 



HL 



1^* Ven 



Fic. 22. — Nerodia pisoator (life size). 



