. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. CROCODILIANS, LIZARDS, AND SNAKES. 1011 TROPIDOCLONIUM Cope. Tropidoclonium Copk, Proo. Acad. Nat. Sci. Phila., 1860, p. 76; Proc. Anier. Phil. Soc, 188G, p. 495; Bull. IT. S. Nat. Mns., No. .32, 1887, p. 60. Head not distinct from body. Teeth equal. Scales keeled; anal plate entire; subciiudal scuta divided. Cephalic scuta normal; two iiiteniasals, rostral not prominent. One nasal and one loreal. with two apical papilla". T
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. CROCODILIANS, LIZARDS, AND SNAKES. 1011 TROPIDOCLONIUM Cope. Tropidoclonium Copk, Proo. Acad. Nat. Sci. Phila., 1860, p. 76; Proc. Anier. Phil. Soc, 188G, p. 495; Bull. IT. S. Nat. Mns., No. .32, 1887, p. 60. Head not distinct from body. Teeth equal. Scales keeled; anal plate entire; subciiudal scuta divided. Cephalic scuta normal; two iiiteniasals, rostral not prominent. One nasal and one loreal. with two apical papilla". This genus shows its position to be in the Natricina^ by the presence of the vertebral hypapophyses on the posterior part of the column. In its entire anal i)late, and in its pattern of coloration, it resembles the genus J^Jntcvnia, and especial!}' such species as IJ. hrachysionia Cope and E. leptocephala Baird and Girard, where the head is not very dis- tinct. It is probably a terrestrial modification of that genus, as the /cirtlandii is oi Xatrix. But one species of the genus is known. The peculiar apical papilhc of the hemipenis I find to be entirely constant. TROPIDOCLONIUM LINEATUM Hallowell. Tropidoclonium lineatum Copk, Proc. Acad. Nat. Sci. Pliila., 1860, j). 76; Check- list N. Amer. Batr. Kept., 1875. p. 42. Micropa lineatus Hallowkll, Proc. Acad. Nat. Sci. Phila., 1856, p. 241. Ischnognathuft lineatus Bouienger, Cat. Snates Brit. Miis., I, 1893, p. 289. The head is quite sma^.l, rounded above, depressed in front; snout subacute; nostril in a single parallelogrammic nasal plate, quite near its superior margin, and much nearer its anterior than its j)osterior ex- tremity; sometimes this plate is cleft inferiorly below the nostril; loreal longer than high; one anterior, two posterior orbitals; six superior la- bials, the eye resting on the third and fourth, the sixth longer than high. Temporals 2-2, the infe- rior of the first row not touching postorbitals, and in
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