The specimens from Transcaucasia constitute a further variety (var. _transcaucasiana_, Boulenger), agreeing with the var. _montandoni_ in the rostral scutellation and in the number of ventral shields (150 to 156), but differing in the markings on the back; these consist of dark bars or alternating paired dark spots, as in the typical form of _V. aspis_. The dark and light markings on the lower lip are as in the typical _V. ammodytes_, and the lower surface of the tail is pale yellow or greenish towards the end. _Habits._--Notwithstanding its name _ammodytes_, this Viper is by no means restricted to sandy localities; on the contrary, it shows a predilection for dry stony hills with low vegetation, and has often been found climbing bushes. It avoids thick forest, but occurs on the edges of woods and in clearings, as well as on the borders of roads through woods. In the cooler regions of the mountains, which it ascends to a considerable altitude, it is essentially diurnal, leaving its retreat only when the sun shines; but in warm localities it is stated to be principally nocturnal, appearing in numbers by moonlight. The length of its period of hibernation depends entirely on the climate, but when the winter is mild it may be seen about in midwinter whenever the sun shines. The poison of this Viper is stated to be more active than that of _V. berus_ and _V. aspis_, and, as the snake is very common in some parts of Austria and the Balkan Peninsula, fatal accidents to man are frequent. The food consists of small mammals and birds, and also of lizards. _V. ammodytes_ does much better in captivity than its European congeners, and takes food more readily. The hissing is louder than in _V. berus_ and _V. aspis_, and it is often produced, on the approach of man, by specimens lying in such perfect concealment that their presence would not otherwise be suspected; this habit, like the rattling of the _Crotalus_, is evidently detrimental to the species in its relation to man. This species is extremely abundant in some parts of Austria, and over 7,000 specimens were killed in a district of Southern Styria in the course of two years (1892, 1893). According to Werner, it is the commonest of all snakes in Bosnia and Herzegovina. _Reproduction._--Pairing takes place in the spring, sooner or later according to altitudes, and the young, five to fourteen in number, are born in August. 27. VIPERA LEBETINA, Linnæus The Blunt-Nosed Viper, or Kufi _Form._--Short and heavy. Snout rounded, obtuse, usually with well-marked canthus, and the loreal region slanting towards the mouth. Eye small, its vertical diameter less than its distance from the mouth in the adult. Nostril large and directed backwards. Length of tail six (males) to ten times (females) in the total length. [Illustration: FIG. 41 (after Sordelli)]