67 
HETERODON PLATIRHINOS.—Latreilie. 
Plate XVII. 
Cuaracters. Head short, flattened, triangular, turned up and pointed at the 
snout, a strong ridge on the rostral plate above; body greyish or yellowish-grey 
above, with large blotches or transverse bars or oblong spots of black; abdomen 
dirty-white. PJ. 144. Sc. 42. 
Synoyymes. Coluber heterodon, Latreille, Hist. Nat. Rept., tom. iv. p. 32, figs. 1, 2, 3. 
Coluber heterodon, Daudin, Hist. Nat. des Rept., tom. vii. p. 153, fig. of head, pl. Ix. 
fig. 28. 
Coluber heterodon, Say, Amer. Jour. Arts and Scien., vol. i. p. 261. 
Coluber heterodon, Harlan, Med. and Phys. Res., p. 120. 
Hog-nose Snake, Vulgo. 
Description. The head is large, flat, triangular, broad behind, with the snout 
pointed and elongated at the tip; it is covered with scales on the posterior part, 
and with plates on the anterior and on the vertex. The vertical plate is regularly 
pentagonal, with its broadest part directed forwards; the superior orbital are 
quadrilateral, elongated, and broadest posteriorly, with their outer margins pro- 
jecting over the eye, which gives a sinister look to the animal. The occipital 
plates are rhomboidal. The frontal are quadrilateral, with their anterior inferior 
angles very much prolonged; the anterior frontal are triangular, with their bases 
directed inwards, and their apices rounded and turned to the nostrils. Between 
the anterior frontal, to prevent them coming in contact with each other, is a 
narrow, elongated, azygous plate, reaching from the posterior frontal to the 
