3. viPERA. 473 



Snout simply turned up or produced in 



an appendage, the raised portion with 



five or six (rarely three) scales ; rostral 



once and a half to twice as deep as 



broad ; ventrals : (J 125-146, J 



135-147 5. latastii, p. 484. 



:Snout produced in an appendage covered 



with 10 to 20 scales ; rostral not 



deeper than broad ; ventrals : ,J 133- 



158, $ 135-162 6. ammodytes, p. 485. 



II. Supraocular shield large, erectile, the free border angular, 

 separated from the eye by a series of small scales ; nostril in a 

 single nasal, which is partially fused with the naso-rostral ; 

 scales in 23 rows ; ventrals 150-180. 



7. raddii, p. 487. 



III. Supraocular shield moderately large or narrow, not erectile, or 

 broken up into scales ; upper surface of head covered with 

 small, imbricate, usually keeled scales ; scales in 23-31 rows ; 

 ventrals 142-180. 



A. Supranasal shield present. 



Scales in 23-27 rows ; supranasal usually 



not bordering the nostril ,8. lehelina, p. 487. 



Scales in 27-33 rows ; supranasal border- 

 ing the nostril 9. russellii, p. 490. 



B. No supranasal ; nostril pierced between two nasals, the 



anterior in contact with the rostral ; scales in 27 rows. 



10. superciliaris, J). 491. 



1. Vipera nrsinii. 



Pelias chersea (non I,.), Bonap. Icon. Faun. Ital. Anf. (1835). 



ursinii, Bonap. I. c. 



— — berus, var. ursinii, Cope, Proc. Ac. Philad. 1859, p. 342. 

 Vipera berus, part., Towmev. Bull. Soc. Zool. Fr. 1881, p. 41. pi. i. 



fig. 785 ; Camerano, Mon. Ofld. Ital., Vip. p. 35, pi. i. figs. 16-18 



(1888). 

 berus, var. rakosiensis, Mihely, Zool. Anz. 1893, p. 190. 



ursinii, Bmileng. Proc. Zool. Soc. 1893, p. 596, pi. li., and 



Feuille Jewries Naiur. 1893, p. 8 ; Mihely, Zool. Anz. 1894, pp. 57 

 & 86 ; Werner, Verh. zool.-bot. Ges. Wien, xliv. 1894, p. 237 ; 

 Mihely, Math. Term. Kozl. Budapest, xxvi. 1895, p. 85, pis. i. 

 &ii. 



berus, Werner, Zool. Anz. 1893, p. 423. 



rakosiensis, MShely, Math. Term. Ert. Budapest, xii. 1894, 



p. 87. 



Snout obtusely pointed, flat above or with the canthus slightly 

 raised ; eye very small, usually smaller than the nasal shield, its 

 horizontal diameter not exceeding its distance from the posterior 



