193 
TEAVELS IN CENTEAL AFEICA. 
and more acute behind. The last costse of the ribs are all wider^ 
compared with the others^ than in that animal. 
A young specimen in spirit^ from the Upper Nile, obtained 
from Mr. Petherick, probably belongs to this species. 
The head, neck, feet, and dorsal disk covered with close, small, 
dark-edged circular white spots, those on the side of the head, and 
especially on the chin and throat, being rather the largest. 
With kind regards, believe me 
“ Yours faithfully, 
JOHN EDW. GRAY. 
J. Petherick, Esq., 
‘‘ See. See., See.” 
Dr. Gray has also given the following description of a new 
species of chamseleon, discovered by Mr. Petherick, in the Pro- 
ceedings of the Zoological Society,^^ 1863, p. 94 : 
This species is very like Chamaeleo Senegalensis ; but the scales 
on the ridges of the back are of the same size as those of neigh- 
bouring parts, and therefore do not form any appreciable crest. 
The occiput is rather differently shaped, the hinder central keel 
being a little more prominent. The scales of the head, body, limbs, 
and tail are smaller and less raised. The limbs are longer and 
more slender. 
This species is very different from the Chamaeleo affinis of 
Riippell (which is the C. Abyssinicus of the Berlin Museum), 
from Abyssinia, which differs from both C. senegalensis and C. 
laevigatas in the scales being much larger and more convex, and 
in the scales of the ridges of the head and back being larger than 
