402 REPORT OF NATIONAL MUSEUM, 1893. 



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



Truk, ill Hammoud's South Carolina, p. 235 (1883). — Kunze, Amer. 



Natural., xvii, 1883, p. 1229.— Yakrow, Bull. U. S. Nat. Mu8., No. 24, pp. 



12, 801,1883).— Garmax, Rept. Batr. N. Am., i,Ophi(l.,pp. 120, 178 (1883).— 



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



Davis and Rice, Bull. Chic. Acad. Sc, i, p. 28 (1883).— Hay, Aiuph. 



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



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

 1799. — Agklstrodon niokaseii, Beai'VOIS, Trans. Am. Philos. Soc, iv. p. 370, footnote. 

 1803. — Cenchris mokesoti, Daudin, Hist. Nat. Rept., v, j). 358. 

 1819. — Scyialus cii2)n'its, Rakixesqi'e, Sillim. .lourn., i, p. 84. — Harlan, Med. 



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

 1819. — Scytale mockeson, Sxy, Sillim. Journ., i, p. 257. — Coirhrismockeson Harlax, 



Journ. Phila. Acad., v, 1827 (p. 366).— Harlan, Med. Phys. Re8.(p.l28) 



(1835). 

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

 1836. — Acontias atrofnsciis, TuoosT, Ann. N. Y. Lye. Nat. Hist., in, p. 180. — Toxi- 



copliis aU-ofnscus, Baird and Girard, N. Am. Serp., p. 150 (1853). — Tri- 



t/onocephalits atrofiixciis, Holbuook, N. Am. Herpet., lii, p. 43 (1842). — 



De Kay, Zool. N. Y., iii, p. 55(1842). — Cenchris atrofuscus, Gray, Ca.t. 



Snakes Brit. Mus., p. 16 (1849). — Jiicistrodon ntrofuscus, Cope, Bull. U. 



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

 1S31 . — Tri{i on oceph a I us cenchris, Schlegel, Essay Physiogn. Serp., i, ji. 191; ii, p. 



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

 1853. — Trigonocephahts histrioninis, Dtmkril, Mom. Acad. Sc. Paris, xxviri (p. 



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

 1883. — Ancistrodon conloririx, var. alrofusfiis, Gar.man, Rept. Batr. N. Am., i, 



Ophid., p. 178. 

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

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

 (1842).— De Kay, Zool. N. Y., in, pi. ix, tig. 18 (1842).— B.\ird, Serp.N. Y., pL 

 I, tig. 3 (1854).— Baird, Pac. R. R. Rep., x, Rept., pi. xxv, fig. 12 (1859).— 

 Jax, Icon. Ophid., livr. 46, pi. v, tig 1 (1874). — BocoiRT, Miss. Sclent. Me- 

 xique, Zool. ni, Rept., pi. xxvm (1882). — Garman, Rept. Batr. N. Am., i, 

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



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

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

 Troost as Acontias atrofnscns, and said to occnr in the monntain regions 

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

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

 gave a tigure 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 fre(iuently tind it among 

 snakes in similar localities. 



DescriiMon* — 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. Labials yellowish white (figs. 

 41 aud 42). 



More slender than Toxicophis [Agl-istrodou] piscivorus. I'lates on 

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

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



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



