168 



SNAKES OF CEYLON. 



line connecting the centres of the eyes. Nasals : Semi- 

 divided or entire, the nostril in the median third of its depth. 

 Loreal : One, not touching the internasal ; touching the eye ; 

 as long as or longer than the nasal. Prse ocular : One. 

 P ost oculars : Two. Temporals: Two, the lower half to three - 

 fifths the length of the supraocular. Supralabials : Seven, the 

 1st and 2nd touching the nasals, 3rd and 4th the eye, and 5th 

 and 6th the lower temporal. Sublinguals : Two pairs, the 

 posterior touching the 4th and 5th infralabials. Infralabials : 

 Five, the fifth twice as broad as the posterior sublinguals, 

 and about as long ; touching three scales behind. 



Costals : As broad as long. In 13 rows in fhe whole body 

 length. Vertebrals : 200 to 243; angulate laterally. Anal: 

 Divided. Supracaudals : In even rows. Subcaudals : 65 to 

 88 ; divided. 



(b) Anomalies — Nasals: Sometimes divided. Prse ocular : 

 Rarely absent. Sometimes two (Boulenger). Supralabials : 

 Sometimes six or eight. Subcaudals : Some near the base of 

 the tail, occasionally entire. 



Fig. 37. — Dryocalamus nympha. 

 (X 3.) 



