SNAKES OF OKYLON. 



545 



Gostals : At midbody. The median rows rectiform, with 

 tylotose keels ; breadth of scales about two-thirds their length, 

 half those of the ultimate row. (Fig. 94.) Four to seven rows 



Fig. 94. — Scales of Echis oarinata. Notice the oblique rows 

 and their serrate keels. 



above the penultimate oblique, with serrate keels, breadth about 

 half their length. Penultimate row rectiform, keeled, in contact 

 with three scales above ; scales as broad as long. Ultimate 

 row enlarged, rectiform, keeled to a variable extent posteriorly, 

 breadth of scales half or less than half their length. In 25 to 

 37 rows in midbody. Two heads-lengths behind the head 

 the rows are 23 to 31, two heads-lengths before the vent, 27 

 to 21. Supracaudals : In odd rows ; keeled to tip of tail. 

 Venfrals : 132 to 195 ; rounded. Anal : Entire. Subcavdals : 

 21 to 48 ; entire. (Fig. 95.) 



Fia. 95. — To show serrate keel of scale of 

 Echis earinata. 



