28 Dr. A. Giinther on new Species of Snakes 
one preocular, nearly reaching the vertical; two postoculars ; 
nine upper labials, the fourth, fifth, and sixth of which enter the 
orbit. Temporals 2+ 2, the two anterior being in contact with 
the postoculars. Scales much imbricate. Ventrals 159; anal 
entire; subcaudals 85. Deep black above and below; only the 
lower side of the head and the thirty anterior ventral shields are 
whitish. 
We have received one example only, in a collection made by 
Lieut. Bell at Sierra Leone; it is 83 inches long, the tail mea- 
suring 9 inches. 
Ahetulla nigromarginata. 
Scales in fifteen rows, slightly keeled. Head small, depressed, 
with the snout of moderate length, subtruncate in front ; rostral 
shield rather broader than high; loreal none; preorbital not 
reaching the vertical; two postorbitals; nine upper labials, the 
fifth and sixth of which enter the orbit ; temporals large, 1+2; 
occipitals rounded, with some larger rounded scales. behind. 
Six lower labials are in contact with the chin-shields. Hye 
rather large, with round pupil. Body and tail slender and 
compressed. Ventral shields 158, slightly keeled; anal bifid ; 
subeaudals 115. Maxillary with a cluster of three or four en- 
larged teeth, which are not grooved and not separated from the 
others by an interspace. Upper parts green ; each head-shield 
and scale with a black margin; sides without band. Lower 
parts uniform greenish. 
This species would enter the subgenus Uromacer of Duméril 
and Bibron. 
The British Museum possesses one example of this species, 
collected by Mr. Bartlett, junr., on the Upper Amazons; it is a 
female, 30 inches long, the tail measuring 10. 
Ferania Sieboldi, Schleg. 
This species attains to a very large size: we have received 
from the late Sir R. Schomburgk a specimen 46 inches long, 
the tail measurig 6 inches; the circumference of the middle of 
its body is 5} inches. The spots which are so very distinct in 
the young are confluent, giving a coarsely reticulated appear- 
ance to the back. Lower part of the sides and belly with black 
cross bands placed at regular intervals. Upperside of the head 
immaculate; a black band from the eye along the temple. 
This specimen, which is from Siam, has 106 ventral shields 
only, and the anterior frontals are confluent into one, so that 
the specimen might be taken for a Hypsirhina. However, an 
original division of the plate is still indicated by an incomplete 
suture. The Hypsirhina Bocourti, noticed by Jan as a new spe- 
cies, is probably not distinct. 
