420 VIPERIDjE. 



These two species are distinguished as follows : 



Rostral as deep as broad ; scales in 27-31 rows .... F. ruxsellii, p. 420. 

 liostral a little broader than deep ; scales in 23-27 rows V. lebetina, p. 421 . 



520. Vipera russellii. 



Russett, Ind. Serp. i, pi. vii, and ii, pi. xxxii. 



Coluber russellii, Shaw, Nat. Miscell. viii, pi. ccxci. 



Vipera elegans, Daud. Rept. vi, p. 124, pi. Ixxiii ; Jan, Icon. Opliid. 



45, pi. vi, fig. 2. 



Echidna elegans, Merr. Tent. p. 153 ; Dum. $ Bibr. vii, p. 1435. 

 Daboia russellii, Gray, Cat. Sn. p. 24 ; Giinth. Rept. B. I. p. 300 : 



Stoliczka, J. A. 8. B. xxxix, 1870, pt. 2, p. 220; Fayrer, Thana- 



toph. pi. xi ; Theob. Cat. p. 217 ; Anders. An. Zool. Res. Yunnan, 



p. 833. 

 Vipera russellii, Strauch, Mem. Ac. St. Petersb. 7, xiv, no. G, Syn. 



Viper, p. 85. 



Snout obtuse ; nostrils very large, between three shields ; rostral 

 about as deep as broad ; a narrow supraocular shield ; upper 

 surface of head covered with small imbricate, strongly keeled scales, 

 in 6 to 8 longitudinal series between the supraoculars ; three or 



Fig. 123. Vipera rttssellii. 



four series of scales between the eye and the labials ; 11 or 12 

 upper labials, fourth largest. Scales sharply keeled, in 27 to 

 31 rows. Ventrals 163-172 ; anal entire ; subcaudals 45-60. 



