106 Mr. BELL on a new Species of Agama. 
piceous disposed in dots, exactly resembling mosaic work, and 
with distinct, large, irregular ocelli of the latter colour, margined 
with white, disposed in transverse series across the back. "There 
is also a white longitudinal central line from the occiput to the 
end of the tail. The under side is of an uniform faint white 
colour, and the femoral pores of a sulphur-yellow. | 
This beautiful and highly interesting species was found by 
Mr. David Douglass in the course of his late indefatigable and 
productive researches in the western parts of North America, 
to whom I am also indebted for the following account of its 
habits. : 
It is seen in great numbers in all woodless sandy arid deserts 
in the interior of the country, on the southern parts of Columbia 
river. Onthe banks of streams, in thickets composed of Purshia 
tridentata, Artemisia and Salvia, it was observed by Mr. Doug- 
lass to take up its abode, in the holes made by species of Lepus, 
Arctomys,&c., which are alternately occupied by them and several 
species of Coluber, which resort there for the purpose of preying 
on these Agame and on the Marmots. It feeds on both animal 
and vegetable substances. In the stomach were found coleo- 
| pterous insects, and the leaves of Purshia, Artemisia, and Salvia. 
Like most others of ihe tribe it is yery Bimble during the sum- 
mer months, and it i is then difficult to capture it; but in April, 
when it first makes cg app earance, - Oc ‘tober, before it 
retires to its winter habitation, being at both seasons weakly, 
it may be readily taken. At such seasons the traveller is con- 
stantly annoyed by them during the night, seeking shelter 
from the cold under his blanket, and is frequently under the 
necessity of removing these little intruders on his rest. **In 
April," continues Mr. Douglass, **I have observed the young, 
not exceeding half an inch in length, perfectly formed, of the 
same colour and equally nimble with the older ones. "The co- 
lour 
