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. Pr&ocular: 

 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. Infralabials : Seven ; the 7th about 

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

 with three scales behind. (Fig. 22.) 



I st Ven 



Fig. 22. — Nerodia piscator (life size). 



