TRIGONOCEPHALUS —Oppel. 
Genus TriconocepHaLus.—Cuaracters. Head large, triangular, covered with 
plates in front, and on the vertex to behind the orbits, and with scales posteriorly; 
a deep pit between the eyes and nostrils; upper jaw armed with poisonous fangs; 
body thick; plates on the abdomen and base of the tail; a few scales at the apex. 
TRIGONOCEPHALUS PISCIVORUS.—Lacépide. 
Plate VII. 
Cuaracters. Head very large, triangular, covered with plates in front, and on 
the vertex, and with scales behind; a deep pit between the eye and nostril; upper 
jaw armed with poisonous fangs; body thick, dusky greenish-brown, tinged with 
yellow, and with transverse bands of black. Pl. 130. Caud. Pl. 29. Se. 4. PI. 
2. Sc. 8. 
Synonymes. Water viper, Catesby, Carol., vol. ii. p. 43, pl. xiii. 
Crotalus piscivorus, Lacépede, Hist. des Serp., tom. ii. p. 424. 
Scytalus piscivorus, Latreille, Hist. des Rept., tom. iii. p. 163. 
Scytale piscivorus, Daudin, Hist. Nat. des Rept., tom. v. p. 344. 
Coluber aquaticus, Shaw, Gen. Zool., vol. iil. p. 425, pl. iii. 
Natrix piscivorus, Merrem, Versuch eines Syst. der Amphib., p. 131. 
Trigonocephalus tisiphone, Cuvier, Reg. An., vol. ii. p. 89. 
Scytalus piscivorus, Harlan, Med. and Phys. Res., p. 129. 
Toxicophis leucostomus, Troost, Ann. Lyc. Nat. Hist. N. Y., vol. i. p. 176. 
Water Moccasin, Vulgo. Cotton Mouth, in the western country. 
Vor. Iti.—5 
