AGAMA STELLIO. 125 
of its tail. I have mentioned these species as it is not at all improbable that some 
of them may be found to enter the valley of the Nile or to extend to the north along 
the mountains to the west of Suakin. 
Synopsis of the Species found in Egypt. 
I. Occipital not enlarged. Caudal scales not forming annuli. No enlarged 
groups of spines on the sides of the head and neck. Dorsal scales 
unequal. 
A. Fourth toe the longest. 
a. Scales on the upper surface of the hind limb equal or nearly so. 
(1) Ventrals smooth or feebly keeled. A small gular pouch in the 
male A. mutabilis. 
(2) Ventrals strongly keeled. A large pouch in the male and female . A. flavirnaculata. 
b. Scales on the upper surface of the hind limb, with larger scales inter- 
mixed ; smaller dorsal scales smooth or indistinctly keeled. No 
gular pouch A. pallida. 
B. Third toe the longest. Median dorsal scales the largest, smooth or 
keeled A. sinaita. 
II. Occipital enlarged. Caudal scales forming annuli. Groups of enlarged 
spiny scales on the side of the head and neck. 
(1) Groups of cephalic and cervical spines well developed, § as long as 
the diameter of the ear-opening ; 62-78 rows of scales around the 
body A. spinosa. 
(2) Groups of cephalic and cervical spines feebly developed, longest spines 
less than § the diameter of the ear-opening; 74-84 rows of scales round 
the body A. hartmanni. 
III. Occipital not enlarged. Caudal scales divided into segments composed of 
two or more rings of scales. 
Sides of head and neck with short spines A. stellio. 
