US-NOCUOUS SEEPENTS. 
151 
tail brown. S. 250 + 140. Country, Island of Java. 
Celebes produces a climatal variety, distinguished by brown 
tints, which pass to black on the posterior parts. 
11. Herpetodryas lineatus. a small species from 
Surinam, where it is very common. Whitish-grey, above 
brownish, with three dark rays ; nineteen rows of smooth 
scales; eye large; vertical plate narrow. S. 170 4-70, 
Brazil produces an Ophidian perfectly analogous ; but all 
its scales are bordered with black, and the interrupted 
dorsal rays are composed of black spots. 
12. Herpetodryas Helena. A very beautiful species 
from Bengal, where it is very rare ; scales small, smooth, 
and disposed in twenty-seven rows; form very slender. 
S. 230 4- 90. Below of a pearly colour ; above of a rosy 
purple, passing to brown towards the posterior parts ; sum- 
mit of the head of this last tint ; a yellowish-green dorsal 
ray ; on the nape a pair of blue claviform streaks, includ- 
ing a zig-zag line which is prolonged on the back. 
13. Herpetodryas Bhodogaster. Colours above as 
in Herp. lineatus ; below red ; form much more slender 
than in the Herp. lineatus ; but the head is rather large, 
massive, and covered with plates not well developed ; frenal 
small; the number of abdominal plates 186, the caudal 
above 70 ; seventeen rows of smooth scales. Inhabits the 
Island of Madagascar. 
14. Herpetodryas geminatus of Java. — Size small; 
form very slender ; trunk cylindrical, everywhere of equal 
thickness ; head small, of the same diameter as the neck, 
depressed, obtuse at the extremity ; fifteen rows of smooth 
lozenge-shaped scales. S. 166 4-105. Marbled with 
dark greyish-brown. Two dorsal rays of a silvery grey ; a 
yellowish half-collar on the nape. 
15. Herpetodryas Bsammophis. — Besembles the Colu- 
ber viriditlavus in habit and system of colours ; but its 
form is more slender ; the abdomen a little angular, and 
the head more lengthened ; the physiognomy recalls that 
of the Bsammophis ; vertical plate elongated. S. 1 96 4- 1 14. 
Seventeen rows of scales, which are lanceolate and smooth. 
Country, New Orleans. 
16. Herpetodryas Dendrophis. — Fifteen rows of 
