420 



VIPERTD^. 



These two species are distinguished as follows : — 



Rostral as deep as broad ; scales in 27-31 rows .... T'. r//>t,<trllii, p. 420. 

 Ikostral a little broader than deep ; scales in 23-27 rows J\ Ivhetina, p. 421 . 



520. Vipera russellii. 



Riissell, Ind. Serj). i, pi. vii, and ii, pi. xxxii. 



Coluber russellii, Slunv, Nat. MisccU. viii, pi. ccxci. 



Vipera elegans, Dimd. Rept. \\, p. 124, pi. ixxiii ; Jan, Icon. Oplid. 



45, pi. vi, tig-. 2. 

 Efhidna elegans, Merr. Tent. p. 153 ; Dum. i^,- Bihr. vii, p. 143/5. 

 Daboia russellii, Grai), Caf. tSn. p. 24 ; Oi'inth. Rept. B. I. \). 390 ; 



Sfoliczka, J. A. S. B. xxxix, 1870, pt. 2, p. 226; Fayrcr, Thana- 



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



p. 833. 

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



Viper, p. 85. 



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

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

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

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



v, _ j§'-/ 



Fig. 123. — Vipera russellii. 



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-GO. 



