16 EEPTILES. 



Cenchris, Daud. Rept. viii. 388. Grai/, Ann. Phil. 1 825. Waxjler, 

 Amph. 175, 1830. Boie, Isis, 1827, 562, not Linn. Angkistrodon, 

 Beauv. Trans. Amer. Phil. Soc. iv. 370. Tisiphone, Fitz. N. Class. 

 63, 1826. Peleas sp., Merrem^ Tent. 149. Tri<Tonocephalus, Hol- 

 brook, N. A. Erp. iii. 33, 1840. Toxicophis, Troost, Ann. Lye. N. 

 H. Neiv York, iii. 176. 



Holbrook described C. contortrix and C. atrofuscus as having 

 smootli scales on the back of the head, and C. piscivorus as having 

 keeled ones. 



1. The Copper-head. Cenchris contortrix. Gray, Ann. Phil. 

 Zool. Misc. 50. Cen. Mokeson, Daud. t. 70, f. 3, 4 ; <. 60,/. 25. Wag- 

 ler, Amph. 175. Harlan, Med. Phys. Res. 128. C. marmorata, Boie, 

 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. 

 Cacodaemon, Shaiv, 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, ^ar/a?i. Cop- 

 per-head, ^7nencaw5. Trigon. Cacodaemon, Boie, Isis, 561. 



Hazel-brown, with dark brown cross-bands, naiTowest on the 

 vertebral line, broader and forked on the flanks ; beneath grayish, 

 minutely punctated. 



a. In spirits. Young. N. America, Texas ? From Mr. Drum- 

 mond's collection. 



2. The Black-brg^vn Mocassin. Cenchris atrofuscus. Toxi- 

 cophis atrofuscus, Troost, Ann. Lye. N. H. New York, iii. 181. 

 Trigonocephalus atrofuscus, Holbrook, N. Amer. Erp. iii. 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 Water 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, 3/erre?w, Tm^. 131. Trigonocephalus 



