110 Proceedings of the Asiatic Society of Bengal. [Xo. 1, 



serrated ridge along the back : gular pouch in the males only, covered 

 with small keel-less scales of equal size ; the other scales of the lower- 

 parts conspicuously carinated ; those of the upper-parts minute, arrang- 

 ed in irregular transverse series (as best seen by aid of a lens), their keels 

 presenting a tuberculated appearance except towards the ridge of the 

 back : a row of about ten large tubercles on each side commencing from 

 the occiput. Colours various, but fugitive in spirit ; the young being 

 much speckled and reticulated with greyish-black, and the full-grown 

 mostly plain, with dark bands on the tail more or less distinct. 

 Length 12 in., of which tail 8f in. Common at Port Blair. 



Of Snakes, we have received five harmless and two venomous species. 

 The former are — 



Lycopon aulicus, (L.). Uniformly coloured variety. 



Dendrophis pictus, (6m.). Some beautiful varieties. 



Dipsas HEXA.GONOTUS, nobis, J. A. S. XXIV, 360. Several young 

 specimens. The adult remains to be described. 



Herpetodryas praspnt/s ; Coluber prasinus, nobis, J. A. S. 

 XXIII, 291. Large. Also inhabits the base of the Himalaya, Asam, 

 Tenasserim, &c. 



Cerberus boeeormis, (Schneider). 



The latter— 



Hamad eyas vittatus, (Elliot). 



Trtmesurus viribis, (Lacepede), var. Cantori, nobis, J. A. S. 

 XV, 377. A Trihesitrus which appears to be exceedingly common 

 both in the Andaman and Kicobar islands is altogether similar in 

 structure to the common Tr. viridis, but varies much in colouring, 

 being grass-green, brown, or blackish, either uniformly coloured or 

 variously mottled ; but only in one mottled specimen from the Nico- 

 bars do I perceive the lateral line on the scales bordering the abdo- 

 minal plates, which is commonly seen in continental examples of Te. 

 yiribis. In a green example from Port Blair, 4 ft. in length (!), 

 there is no trace of this ; but I may here call attention to the fact 

 that there are certainly two nearly affined species confounded under 

 Te. yieidis. One common in Lower Bengal has the scales more 

 strongly carinated, very conspicuously so on the sides of the head, 

 while those of the crown are roughly granular (a modification of the 

 more developed keels), instead of being flat or almost flat as in the 



