402 REPORT OF NATIONAL MUSEUM, 1893. 



Sc, VH, p. 121 (1881).— Smith, Rep. Geol. Snrv. Ohio, iv, 1882, p. 675.— 



True, in Maimnoturs South Carolina, p. 285 (1883).— Kunze, Anier. 



Natural., xvii, 1883, p. 1229.— Yarrow, Hull. U. S. Nat. Mus., No. 24, pp. 



12, 80(1883).— Garman, Rept. Batr. N. Am., i, Ophid., pp. 120, 178 (1883).— 



Davis and Rice, Bull. 111. State Lab. Nat. Hist., i, No. 5 (p. 28) (1883).— 



Davis and Rice, Bull. Chic. Acad. 8c. , i, p. 28 (1883;.— Hay, Aiuph. 



Rept. Indiana, p. 13 (1885).— H. Garman, Bull. 111. State Lab. Nat. 



Hist., Ill, p. 314 (1892). 

 1799. — Agkistrodon mokasen, Beaivois, Trans. Am. I'hilos. Soc, iv, p. 370, footnote. 

 1803. — Cenchrismokesoii, Daudin, Hist. Nat. Rept., v, p. 3.58. 

 1819. — Scjjfalns ciipreus, Rakinesque, Sillini. .Joiirn., i, p. 84. — Harlan, Med. 



Phys. Res. (p. 130) (1835). 

 1819. — Sciftaleinorkenoii, Say, Sillim. Journ., i, ]).257. — (ciichrismockeson Harlan, 



.lourn. Piiila. Acad., V, 1827 (p. 366).— Harlan, Med. Phys. Re8.(p.l28) 



(1835). 

 1827. — Cenchris marmorata, BoiE, Isis, 1827, p. 562. 

 1836.— Jcon^ifls afrofuscus, Troost, Ann. N. Y. Eye. Nat. Hist., iii, p. 180.— Toxi- 



cophis atrofuscHS, Baird and Girard, N. Am. Serp., p. 150 (1853). — Tri- 



(/onocephalus atrofnscus, Holbrook, N. Am. Herpet., in, p. 43 (1842). — 



De Kay, Zool. N. Y.,iii, p. 55 (1842).— renc/ir/s a<ro/H8CMs, Gray, Cat. 



Snakes Brit. Mus., p. 16 (1849). — AncAstrodon atrofnscus, Cope, Bull. U. 



S. Nat Mus., No. 1, p. 34 (1875). 

 lS37. — Trifionoce2)halns cenchris, Schlegel, Essay Physiogn. Serp., i, p. 191; ii, p. 



.553. — Max v. Wied, Verz. Rept. Reise N. Amer., p. 77 (1865). 

 ISo'S.—Trigonocephalus histrionicns, Dumeril, Mem. Acad. Sc. Paris, xxviii (p. 



534) ; Prodr. Class. Serp., p. 138. 

 1SS3.— J iicistrodon contoririx, var. alrofuscm, (tARMAn, Rept. Batr. N. Am., i, 



Ophid., p. 178. 

 Figures.— Dwm^, Hist. Nat. Rept., v (pi. lxx, tigs. 3, 4), (1803).— Holbrook, N. 

 Am. Herpet., 1 ed., ii, pi. xiv (1838); 2 ed., iii, pi. viii; pi. ix (alrofiiscua) 

 (1842).— De Kay, Zool. N. Y., in, pi. ix, tig. 18 (1842).— Bairi>, Serp.N. Y., pi. 

 I, fig. 3 (1854).— Baird, Pac. R. R. Rep., x, Rept., pi. xxv, fig. 12 (18.59).— 

 Jan, Icon. 0]»hid., livr. 46, pi. v, fig 1 (1874). — Bocoirt, Miss. Scient. Me- 

 xiqne, Zool. iii, Rept., pi. xxviii (1882). — (xArman, Rept. Batr. N. Am., i, 

 Ophid., pi. VIII, fig. 1 (1883).— Brehm's Thierleben, 3 ed., vii, p. 468 (1892). 



It does not appear that any competent lierpetologist has ever exam- 

 ined a specimen of the so-called " Highland Moccasin," described by 

 Troost as Acontias atrofnscus, and said to occur in the mountain regions 

 from Virginia southward, and its status is therefore so doubtful that I 

 have not ventured to treat it as a separate form. Even Holbrook, who 

 gave a figure and a lengthy description, did not see a specimen, and 

 furnished it only on Troost's authority. On the whole, this variety 

 appears to be only a partial melanism, as we freciuently find it among 

 snakes in similar localities. 



Description* — Loral present. Labials not entering into the orbit. 

 Dorsal rows of scales, 23. Color, light chestnut, with inverted y- 

 shaped darker blotches on the sides. T^abials yellowish white (figs. 

 41 and 42). 



More slender than To.ricophis [AfflisfrofJon] piscivorns. Plates on 

 neck and side smaller. Two anterior orbitals, one above the other, the 

 lower narrower and forming the posterior wall of pit. A distinct loral 



By S. F. Baird, in Baird and Girard's N. Am. Serp., p. 17. 



