. Asiatic herpetological research. Reptiles -- Asia Periodicals; Amphibians -- Asia Periodicals. FIG. 10. Holotype of Vipera darevskii (ZIN 19934). a. dorsal view, b. ventral view, c. head. narrow. Its length is equivalent to times its width. Parietals are slightly longer than the frontal. The frontal is separated from supraoculars, which protrude over lateral edge of the snout, by a row of three scales. Prefrontal is triangular, three times shorter than the frontal, and is separated from the rostral by 2 scale rows. Nostril is cut through in the lower part of the nasal. The latter is sep
. Asiatic herpetological research. Reptiles -- Asia Periodicals; Amphibians -- Asia Periodicals. FIG. 10. Holotype of Vipera darevskii (ZIN 19934). a. dorsal view, b. ventral view, c. head. narrow. Its length is equivalent to times its width. Parietals are slightly longer than the frontal. The frontal is separated from supraoculars, which protrude over lateral edge of the snout, by a row of three scales. Prefrontal is triangular, three times shorter than the frontal, and is separated from the rostral by 2 scale rows. Nostril is cut through in the lower part of the nasal. The latter is separated from the rostral by a broad scale. Upper labials and lower labials are both 9 to the right and 8 to the left. There are 5 rows of throat scales. Around the center of the body there are 21 scale rows with strongly expressed keels, except for two scale rows on both sides adjacent to the ventrals, which are smooth. The number of ventrals is 138. There are 25 pairs of subcaudals. The color is yellowish grey. A zig-zag shaped brown stripe runs along the dorsum. At the center of the body its width is nearly 8 mm. A row of hardly conspicuous spots is present laterally. The spots merge into a light brown stripe. Dorsally, the head has light yellowish spots along the edges of the frontal, parietals and lower oculars with yellowish temporals. Ventrum is blackish marked by light contours of ventrals (Fig. 10). Paratypes: Morphological characters of 8 paratypes are listed in the tables 1-4. General color resembles that of the holotype, except for 2 specimens. In the latter the dorsal stripe is interrupted in the anterior part of the body (Fig. 11). Diagnosis: This viper is not large. SVL reaches 460 to 489 mm. Head is slightly impressed dorsally, covered by big scales. Lateral edges of snout are slightly pointed. Anterior snout edge is rounded. Nostril is cut through in lower part of the nasal. Head is narrow, hardly separated from body. Remarks and variability. Morphologically, Vip
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