154 
ON THE PHYSIOONOMY OE SEEPENTS. 
nated by a blunt point ; tbe vertical plate less lengthened 
than ordinary. All the teeth of equal length ; above yel- 
lowish-green, varied by five dark rays, which become less 
distinct by age ; below yellowish. Size about 3 feet. 17 
to 19 rows of lanceolate smooth scales. S. 190 + 122. 
6. PsAMMOPHis Dahlii. Approaches by its very long 
and slender form to the Dendrophis. Abdomen slightly 
angular ; head narrow and long, but furnished with plates 
more developed than in all the preceding species ; eye 
large : two anterior ocular plates. All the teeth of equal 
length. A large supernumerary gland behind the lachry- 
mal. Above olive-grey ; four or five ocellated spots on 
the sides of the neck. Length 3 to 4 feet. S. 211 + 122. 
Native of Dalmatia ; and is also perhaps to be found in 
Egypt. 
7. PsAMMOPHis ELEOANS. A Very handsome and rare 
species from the western coast of Africa. F orm very slen- 
der ; muzzle lengthened, conical, a little turned up, and 
truncated downwards ; above pale brown, with three obse- 
lete rays ; below four obsolete greenish rays on a yellow 
ground. S. 191 + 159. 17 rays of small lanceolate smooth 
scales. 
8. PSAMMOPHIS Temminckii. Unites the habit and 
massy form of a Coluber, to the physiognomy of a Psam- 
mophis. Abdomen narrow and angular ; above of a clear 
brown, relieved by four dark rays ; scales marked by one 
or more black spots. S. 180 + 105. From Chile. 
In all probability, we should arrange in this genus the 
Condanarouse of Russel, a native of Ganjam ; but which 
appears to me much allied to the Psammophis Moniliger, 
which is spread over almost all Africa. — Part ii. 
The fourth family of Innocuous Serpents includes the 
Tree-Snakes, They are particularly adapted to inhabit the 
vast forests of hot climates. They are in very small num- 
bers in Africa, and very rare in New Holland ; Europe 
only produces anomalous species. They usually have a 
very elongated figure, pass the greatest part of the day on 
trees or on bushes, and feed on birds or on Saurian reptiles. 
The first genus of this family is 
