SNAKES or CEYLON. 527 



pair ; touching four or five infralabials. Infralahials : 

 Five ; the last largest and in contact with two scales behind. 

 (Fig. 91.) 



Fig. 91. — Vipera russelli. 

 (Life size.) 



Gostals : Longer than broad, reotiform, strongly keeled with 

 paired apical facets. The keels in the last row, where present, 

 are oblique. Vertebrals not enlarged ; the breadth of the 

 scales less than half their length, and less than half the breadth 



