158 ON THE rilTSIOGNOMY OF SERPENTS. 



iiatcd ; colour of a clear brown, passing to yellow on the 

 lower parts ; foinn less slender than usual ; belly slightly 

 angular. S. 148 4-136. 



3. Dryiophis prasina. Head conical ; muzzle trun- 

 cated ; rostral plate with salient edges ; labials very deep 

 grooved teeth very large ; scales smooth. S. 200 + 160. 

 Native of Bengal, Cochin-China, Java, Sumatra, and 

 Celebes : the individuals of this latter isle form a variety 

 with more slender tail. 



B. The Pseudo-Dri/iophis or Dtyiophis of the New 

 World, with the teeth less developed, and pupil orbicular. 



5. Dryiophis Catesbyi. Colour green ; scales cari- 

 nated ; muzzle very compressed and very obliquely trun- 

 cated at the point. S. 204 + 140. From Cayenne to 

 Florida. 



6. Dryiophis argentea. Form more delicate than 

 usual ; six plates on the upper lip ; smooth scales. Colour 

 silvery-white, speckled with a darker tint, and adorned on 

 the sides and below with broad longitudinal rays of deep 

 blue. S. 200 + 90. Inhabits Cayenne. 



7. Dryiophis aurata, has a form more light still than 

 the preceding; all the parts extremely delicate. S. 

 190 + 162. Of a fine gilded bronze colour, dotted with 

 black and white. Found from Brazil to Mexico, and per- 

 haps also in Florida. 



dipsas. 



The tree-snakes, in the genus Dipsas, are recognisable 

 by their very thick, broad, and obtuse heads, their vigor- 

 ous, but compressed, trunk, the pupil ordinarily vertical, 

 &c. They have, however, the elongated form peculiar to ani- 

 mals of this family. Their scales are generally smooth and 

 lanceolate ; and we observe in many species, a dorsal range 

 of plates, larger than the rest ; the plates of the head 

 very aggregated ; abdomen convex ; nostrils very open. 

 Sometimes we find in the jaw a posterior grooved tooth. 

 The Dipsas inhabits, by preference, the vast forests of 

 Asia and intertropical America. Other parts of the world 



