SNAKES. 71 
streaks ; belly white, with two broad black streaks, formed of two 
large semicircular black spots on the front edge of each ventral 
shield; subcaudal shield black, with a narrow white edge; loreal . 
shield small; oculars small, two anterior and three posterior, lower 
very small. 
a. In spirits. India? Presented by the Zoological Society. 
24. Henicops. 
Head ovate, indistinct, shielded: frontal anterior trigonal, be- 
tween the nasal plates; superciliaries small; occipital elongate ; 
upper labials entire ; loreal distinct: two anterior and two posterior 
oculars : body fusiform ; scales (19 rows) truncated, polished, smooth, 
of middle of hinder part of back and tail keeled: tail tapering. 
American. 
Helicops sp., Wagler, Syst. Amph. 170, 1830: Fitz. S. R. 25, 
1843. Helicops, Gray, Zool. Misc. 65, 1842. Pseudoeryx sp., Fitz. 
N. Class. Rept. 55, 1826. Natrix sp., Wagler, Serp. Braz. 27. 
Anat., Schlegel, Phys. Serp. 353. 
1. The Hettcors. Helicops carinacaudus, Wagler, Amph. t. 7. 
Fitz. S. R. 25. Col. eneus, Hemprich, Mus. Berlin. Pseudoeryx 
eneus, Fitz. N. Class. Rept. 55, 1826. Homalopsis carinacauda, 
Bote, Isis, xx. 551. Schlegel, Phys. Serp. 350, t. 13, f. 18, 19. 
Coluber carinacaudus, Neuwied, Beitr. i. 302. Abbild. xi. t. 3. 
Dark olive, paler beneath, darker on the edge of the plates : 
scales of the front and sides of body smooth, of the hinder part of 
back and tail strongly keeled. 
a. In spirits. N. America. From the Leyden Museum. 
ttt Hinder labial large, like others ; scales smooth. 
25. Hypsirutna. 
Head small, distinct; crown shielded: frontals 3; anterior 
transverse, small; vertebral and superciliary rather small; occipi- 
tal moderate ; loreal square; upper labial large, entire; seventh 
large : eye over the fourth or fourth and fifth labial: body fusiform ; 
scales smooth; tail conical. 
Hypsirhina, Wagler, Syst. Amph. 169, 1830. Gray, Zool. 
Misc. 65, 1842. Fitz. S. R. 25. Hypsiscopus, Fitz. S. R. 25, 
