302 
REPTILES. 
occiput somewhat prominent; plates of the abdomen single; 
back carinated with a longitudinal row of broad scales. 
Pseudoboa fasciata .— The Fasciated Boa. 
Yellow; body subtriangular, with blue annulations. Five 
feet long. Inhabits India.— Shaw , III. pi. 99. 
Genus 16.—T RIME RE S UR US. — Lacepede. 
Generic Character. —Head with large plates ; those under the 
tail and near the vent single, but double towards the extremity. 
Trimeresurus leptocephalus. ^ 
Head very small, with nine large plates; scales on the neck 
striated, the others smooth.— An. Mus. IV. pi. 56. fig. 1. 
Genus 17_HYDROPHIS— Cuvier. 
Generic Character. —Head small, covered with large plates ; 
abdomen provided with a row of scales larger than the others ; 
tail compressed. 
Hydrophis spiralis. — The Spiral Hydrus. 
Yellow, with deep chestnut-brown bands, having a longitudinal 
band, and intermediate spots ; longitudinally confluent beneath ; 
body spirally contorted, and flattened obliquely in alternate divi¬ 
sions on one side, and rounder on the opposite; back with a 
sharp carina. Two feet long. Habitat unknown.— Shaw, III. 
pi. 125. 
Genus 18. — PELAMIS.— Cuvier. 
Generic Character .—Abdomen and head with larger plates 
than the body; occiput tumid; scales of the body small and 
equal; tail compressed. 
Pelamis bicolor — The Black-Backed Pelamis. 
Head and upper parts intense black; under parts pale yellow; 
tail spotted with black ; side scales small, of a gamboge yellow 
colour. Two and a half feet long. Inhabits the sea at the Is¬ 
land of Otaheite.— Shaw, III. plate 126. 
Genus 19.—CHERSYDRUS. — Cuvier. 
Generic Character .—Head small, obtuse; back triangular and 
