TRIGONOCEPHALUS CONTORTRIX.—Linnzus. 
Plate VIL. 
Cuaracrers. Head very large, triangular, covered with plates in front, and 
on the vertex, with scales behind; a pit between the eye and nostril; upper jaw 
with poisonous fangs; body thick, light hazel-nut brown, with transverse bars of 
dark brown, narrowest on the mesial line, broader and bifurcating on the flanks: 
tip of the tail corneous. Pl. 150. Caud. Pl. 42. Se. 4. 
SynonymeEs. Boa contortrix, Linnwus, Syst. Nat., vol. i. p. 373. 
Angkistrodon mokeson, Beauvais, Trans. Amer. Phil. Soc., vol. iv. p. 381. 
Cenchris mokeson, Daudin, Hist. Nat. des Rept., tom. y. p. 358, pl. xl. fig. 3. 
Scytalus cupreus, Rafinesque, Am. Journ. Arts and Sci., vol. i. p. 85. 
Scytalus cupreus, Harlan, Med. and Phys. Res., p. 130. 
Cenchris mokeson, Hurlan, Med. and Phys. Res., p. 128. 
Copperhead, Vulgo. 
Description. The head is very large, triangular, and broadest posteriorly; the 
mouth large, with the upper jaw strong, and furnished with poisonous fangs; the 
vertical plate is regularly pentagonal, with an acute angle directed backwards; 
the superior orbital plates are irregularly triangular, with their apices turned 
inwards, and their bases outwards, projecting over the eye; the occipital are 
rhomboidal; the frontal plates are Jarge and quadrilateral; the anterior frontal are 
of the same form, but smaller; the rostral is large, triangular, with its basis 
downwards, and its apex upwards and truncate. There are two nasal plates, the 
anterior quadrilateral, with its posterior margin hollowed; the posterior trapezoid, 
with its anterior border lunated to complete the nostril. There are three 
posterior orbital plates nearly of the same size, the upper one triangular; the 
