. Central Asiatic Expeditions of the American Museum of Natural History, under the leadership of Roy Chapman Andrews : preliminary contributions in geology, palaeontology, and zoology. Central Asiatic Expeditions (1921-1930); Scientific expeditions; Natural history; Scientific expeditions; Natural history. Fig. 14. Natrix popei, new species, A. M. N. H. No. 27763. Dorsal, ventral, and lateral views of head, X 2. Maxillary teeth 20, gradually enlarged j)osteriorly. Rostral vertical, only its edge visible from above, wider than high, its suture with the about equal to that with the f
. Central Asiatic Expeditions of the American Museum of Natural History, under the leadership of Roy Chapman Andrews : preliminary contributions in geology, palaeontology, and zoology. Central Asiatic Expeditions (1921-1930); Scientific expeditions; Natural history; Scientific expeditions; Natural history. Fig. 14. Natrix popei, new species, A. M. N. H. No. 27763. Dorsal, ventral, and lateral views of head, X 2. Maxillary teeth 20, gradually enlarged j)osteriorly. Rostral vertical, only its edge visible from above, wider than high, its suture with the about equal to that with the first labial; suture about two- thirds as long as that of the prefrontals; nasal divided, nostril lateral; loreal nearly quadrangular, a little longer than high; one preocular and three ; temp- orals 2-2 on each side, the upper anterior small; upper labials 8, the fourth and fifth ent(;ring the eye; lower labials 9, four in contact with the anterior chin-shields, which are shorter than the posterior; first pair of lower labials separated by the triangular mental. Dorsal .scales distinctly keeled, the outermost row smooth, in 19-17 rows; apical pits absent on most scales, occasionally present, but small and faint; ventral plates 133, subcaudals 78; anal divided. Gene al dorsal color dark brownish gray, lightest in two dorsolateral bands, in which are situated, on each side, a row of white, vertical, dark-edged spots, extending to about mid-body, posteriorly; venter white, a row of black spots on each side, one on each ventral, larger posteriorly and confluent into black latero-ventral lines; ventrals (jutsitle of these spots clouded with the dorsal color; each side of the neck with a broad light mark, the two nearly united dorsally; top of head, and lateral scales, with fine vermiculations or punctulations of white spots; a labial pattern of the vibakari type (compare Stejneger, 1907, fig. 240); first six labials white with black po
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