REPTILES. 
303 
carinated; body thicker in the centre, and tapering abruptly 
towards the tail ; head and body covered with small scales; ab¬ 
domen carinated. 
Chersydrusfasciatus. — The Fasciated Chersydrus. 
Dusky-brown, with paler bands. Eighteen inches long. 
Inhabits Java. — Shaw, III. plate 130. 
***** With isolated poison fangs. 
Genus 20.—CROTALUS.— Linnaeus. 
Generic 'acler. —Head broad, triangular, and depressed ; 
scales carinated; tongue bifurcate; a depression behind the 
nostrils; upper maxillary bones with isolated fangs ; tail with 
transverse plates ; extremity provided with a rattle of hollow, 
rigid, articulated, and moveable, plates. 
* Scales of the head and back the same. 
Crotalus horridus. — The Rattlesnake. 
Plate LXXI. fig. 7. 
Brown, with transverse, irregular black bands; point of the 
tail dusky. Eight feet long. Inhabits America. 
** Head provided with large plates. 
Genus 21. — SCYTALUS. —Latreille. 
Generic Oiaracter. — Upper jaw provided with poisonous 
fangs ; body and tail with a row of transverse plates. 
Scytalus ziczac. — The Horatta Boa. 
Dark brown, with an undulated yellow band on each side, and 
a row of dorsal spots. Fifteen inches long. Inhabits India. 
Russ. Ind. Sub. fig. 2. pi. 2. 
Genus 22.—ACANTHOPHIS.— Daudin. 
Generic Qiaracter. —Anterior part of the head with large 
plates ; upper jaw with poisonous fangs ; back part of the head 
tumid, and with scales the same as on the back; under the tip 
of the tail are double plates, and terminated by a pointed spur. 
2 b 2 
