. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. CROCODILIANS, LIZARDS, AND SNAKES. 953 Pupil elliptic, erect. Head distinct, broad posteriorly, body cylindrical. Cephalic shields normal. Two nasals, nostril between; oneloreal; two preoculars and two postoculars. Scales smooth. Gastrosteges not angnlated. Anal and subcaudal scntelLT3 divided. Tail not elongate. This genus includes four species of Central America, Mexico, and parts of the United States adjacent to the latter. They are of s
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. CROCODILIANS, LIZARDS, AND SNAKES. 953 Pupil elliptic, erect. Head distinct, broad posteriorly, body cylindrical. Cephalic shields normal. Two nasals, nostril between; oneloreal; two preoculars and two postoculars. Scales smooth. Gastrosteges not angnlated. Anal and subcaudal scntelLT3 divided. Tail not elongate. This genus includes four species of Central America, Mexico, and parts of the United States adjacent to the latter. They are of small size, and resemble considerably the more robust species of iSibon. Their vertical pn])il indicates that they are of nocturnal habits. But one species enters the limits of the United States. HYPSIGLENA OCHRORHYNCHA Cope. Hypsiglena ochrorhynchns Cope, Proc. Acad. Nat. Sci. Phila., 1860, p. 246. Hypsiglena chlorophwa Cope, Proc. Acad. Nat. Sci. Phila., 1860, p. 246.—Boulen- GER, Cat. Suakes Brit. Mns., II, 1894, p. 209, Muzzle shortly conic; rostral plate prominent, encroaching a little on the prefrontals. Nasal plates indistinctly separated, equal, their upper and lower borders parallel. Loreal longer than high. Lower preocular small, bounded anteriorly by the third upper labial. Eight upper labials, fourth and fifth entering the orbit; sixth and seventh very large. Vertical plate twice as long as broad; lateral borders slightly convergent. Superciliaries narrow; oc- cipitals as long as, or longer than, verti- cal, and rounded posteriorly. Inferior labials eleven, sixth largest. Geneials two pairs, the posterior acute. Scales in twenty-one rows. Gastrosteges, 1G8; urosteges, 48 pairs. The upper surface light gray, with a Fig. 245. series of large brown spots, separated iiypsiglenaochrorhtnchaCope. by intervals of one scale wide. These ^ ^?^^ , x^ ^ J? . • ^ i. ' T_ Capo St. liucas, Lower California. spots are about forty eight m number, ^ .7 0 7 C3t_ j^o_ 5„l^;j^
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