16 REPTILES. 
Cenchris, Daud. Rept. viii. 388.. Gray, Ann. Phil. 1825. Wagler, 
Amph. 175, 1830. Bote, Isis, 1827, 562, not Linn. Angkistrodon, 
Beauv. Trans. Amer. Phil. Soc. iv.370. Tisiphone, Fitz. N. Class. 
63, 1826. Peleas sp., Merrem, Tent. 149. Trigonocephalus, Hol- 
brook, N. A. Erp. iii. 33, 1840. Toxicophis, Troost, Ann. Lyc. N. 
H. New York, iii. 176. 
Holbrook described C. contortrix and C. atrofuscus as having 
smooth scales on the back of the head, and C. piscivorus as having 
keeled ones. 
1. The Coprper-HEAD. Cenchris contortrix, Gray, Ann. Phil. 
Zool. Misc.50. Cen. Mokeson, Daud. t. 70, f. 3,4; t.60, 7.25. Wag- 
ler, Amph. 175. Harlan, Med. Phys. Res. 128. C. marmorata, Boze, 
MSS. Isis, 1827, 562. Boa contortrix, Linn. S. N. 373. Coluber 
contortrix, Linn. S. N.ed.10,216. Heterodon contortrix, Cuv. R. A. 
Trigonocephalus contortrix, Holbrook, N. Amer. Erp. t. 14. C. 
Cacodemon, Shaw, Zool. iii. 377. Scytalus cupreus, Rafinesque, 
Amer. Jour. Art. & Sci. i. 85. Harlan, Med. and Phys. Res. 130. 
Trigonocephalus Cenchris, Schlegel, 553, t.20, f.10,11. Tisiphone 
cuprea, Fitz. Syst. 63. Black and Brown Viper, Catesby, Carol. t. 
44, f.5. Pelias niger, Merrem, Tent. 149. Scytale nigra, Daud. 
Rept. v. 342. Angkistrodon Mokeson, Palis. de Beauv. Trans. 
Amer. Phil. Soc. iv.370, 380. Bastard Rattle-snake, Harlan. Cop- 
per-head, Americans. Trigon. Cacodemon, Boie, Isis, 561. 
Hazel-brown, with dark brown cross-bands, narrowest on the 
vertebral line, broader and forked on the flanks ; beneath grayish, 
minutely punctated. 
a. In spirits. Young. N. America, Texas? From Mr. Drum- 
monda’s collection. 
2. The Biack-Bprown Mocassin. Cenchris atrofuscus. Toxi- 
cophis atrofuscus, Troost, Ann. Lyc. N. H. New York, iii. 181. 
Trigonocephalus atrofuscus, Holbrook, N. Amer. F'rp. ii. 43, t. 9. 
Dusky, with a series of large, lozenge-shaped, dark-centred, 
pale spots on the vertebral line; scales of the hinder part of the head 
small, hexagonal and smooth. 
Inhab. N. America, Tennessee. Troost. 
Perhaps a variety of the former. 
3. The Warer Viper. Cenchris piscivorus, Gray, Zool. 
Misc. 51. Water Viper, Catesby, Carol. ii. 43, t. 43. Crotalus pis- 
civorus, Lacep. Herp. ii. 424. Scytalus piscivorus, Latr. Rept. iii. 
163. Harlan, Med. and Phys. Res. 129. Scytale piscivorus, Daud. 
Rept. v. 343. Coluber aquaticus, Shaw, Zool. iii. 425, t. 3, from 
Catesby. Natrix piscivorus, Merrem, Tent. 131. Trigonocephalus 
