. Bulletin of the American Museum of Natural History. Natural history; Science. 86 Bulletin American Museuin of Natural History IVol. XLIX The largest male measures 1900 mm., the largest female 2160 mm. The tail length varies from . of the total in both sexes, mean .29 in twelve females, .30 in six males. The ventrals range from 192-205, mean 199 in males, and from 206-211, mean 208 in females. The subcaudals range from 144-152, mean 147 in males, from 135-155, mean 143 in females. In one specimen the dorsal scale rows are 19-17-lS, and in one 21-21-13, all others 19-19-13. The large pre
. Bulletin of the American Museum of Natural History. Natural history; Science. 86 Bulletin American Museuin of Natural History IVol. XLIX The largest male measures 1900 mm., the largest female 2160 mm. The tail length varies from . of the total in both sexes, mean .29 in twelve females, .30 in six males. The ventrals range from 192-205, mean 199 in males, and from 206-211, mean 208 in females. The subcaudals range from 144-152, mean 147 in males, from 135-155, mean 143 in females. In one specimen the dorsal scale rows are 19-17-lS, and in one 21-21-13, all others 19-19-13. The large preocular frequently is semi- divided, and is entirely divided in three specimens, on one of which there are three preoculars on each side. Postoculars uniformly 3, "one. Fig. 6. Dorsal and lateral views of head and front view of rostral of Thi-asops jacksoni Gunther, (12144, X 2). specimen having 4 on on(^ side. Temporals 1-1 in every specimen. Upper labials invariably 8, lower 10-12. Parietals as long as the frontal or longer. Twelve specimens, ranging from 1235 mm. to the largest, are black, with a grayish throat. In the smallest of these, faint marbling of the ventrals and lighter spots on the dorsal scales are distinguishable under alcohol. In six specimens from 643-1313 mm. a spotted coloration, as in juvenile Thrasops flavigularis, is exhibited. In No. 12141 the throat is bright yellow, extending to about the fifteenth ventral. Posterior to this the ventrals are marked with black and j^ellow, alternately disposed, a ventral which is black-yellow-black-yellow-black, from side to side, being. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Allen, J. A. (Joel Asaph), 1838-1921; American Museum of Natural History. New York : [American Museum of Natural History]
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