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: g 125-146, 9? 
LO LEE Aas a's ss ce 1 eee ee 5. latastii, p. 484. 
‘Snout produced in an appendage covered 
with 10 to 20 scales; rostral not 
deeper than broad; ventrals: ¢ 133- , 
Sere IO0hOe ll heehee 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. lebetina, p. 487. 
Scales in 27-33 rows ; supranasal border- 
Ig. ERE ROME Gus vitae «unl ete lcles 9. russellir, p. 490. 
B. No supranasal; nostril pierced between two nasals, the 
anterior in contact with the rostral ; scales in 27 rows. 
10. superciliaris, p. 491. 
1. Vipera ursinii. 
Pelias chersea (non L.), Bonap. Icon. Faun. Ital. Anf. (1835). 
ursinii, Bonap. 1. e. 
berus, var. ursinii, Cope, Proc. Ac. Philad. 1859, p. 342. 
be iy berus, part., Tournev. Bull. Soc. Zool. Fr. 1881, p. 41. pl. i. 
e: a Camerano, Mon. Ofid. Ital., Vip. p. 35, pl. i. figs. 16-18 
(1888). 
berus, var. rakosiensis, Méhely, Zool. Anz. 1893, p. 190. 
ursinii, Bouleng. Proc. Zool. Soc. 1893, p. 596, pl. li., and 
Feuille Jeunes Natur. 1893, p.8; Méhely, Zool. Anz. 1894, pp. 57 
& 86; Werner, Verh. zool.-bot. Ges. Wien, xliv. 1894, p. 287; 
eae Math. Term. Kozl. Budapest, xxvi. 1895, p. 85, pls. i. 
ii. 
berus, Werner, Zool. Anz. 1898, p. 423. 
BE gata Méhely, 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 
