108 
THE EEPTILES OF EGYPT. 
was quite as large as an egg and lay to the right of the mesial line, i. e. on the side in 
which there was most room. 
This species, which has only been recorded from the right bank of the Nile, ranges 
northwards from Sennaar across the Isthmus of Suez to Southern Syria, the Sinaitic 
Peninsula, Arabia, Medina, Aden, Hadramut, Maskat, and Persia (A. Dumeril) 1 . 
Measurements &c 
■of A. 
sinaita, 
Hey den (in millim.). 
Sex. 
Snout 
to 
■vent. 
Tail. 
Length 
of 
head. 
Width 
of 
head. 
Length of 
fore limb 
from head 
ofhumerus. 
Length of 
hind limb 
from 
behind. 
Length 
of 
tibia. 
Prceanal 
pores. 
Locality. 
?.... 
90 
162 
23 
21 
53 
70 
26 
Guarda, Dongola. 
?.... 
76 
124 
21 
18-5 
49 
68 
26 
4 
Plain of Suez. 
?.... 
65 
140 
18-5 
17 
44 
65 
24 
4 
Desert above Wddi Hoaf, 
Heluan. 
c? .... 
62 
147 
17 
17 
41 
65 
24 
4 
.. 
juv. . . 
43 
83 
12 
11-5 
29 
41 
14-8 
4 
" " " " 
I have examined the types of A. sinaita, Hey den, and A. arenaria, Heyden, preserved 
in the Frankfort Museum. The type of the former is a male with no gular pouch, and 
with six large prseanal pores, i. e. with the same number as occurs in the specimens in 
the British Museum referred to A. arenaria. The dorsal scales are small and imbricate, 
but feebly so, of very uniform size, but very regularly decreasing in dimensions towards 
the sides, where they are very small, yet still feebly imbricate. They are quite smooth 
on the anterior part of the body, but the scales on the limbs and sacral region appear 
to have been keeled, but only feebly so. The features of this individual are the small 
size of the dorsal scales, the regularity of their arrangement, their little imbrication, 
and their generally hexagonal form. The scales on the ventral surface are almost as 
large as the central line of scales on the back, and are smooth, or feebly keeled here 
and there. The scales on the outer sides of the limbs are considerably larger than any 
of those on the body, are strongly imbricate, and markedly keeled. The limbs are 
long and slender, and the third digit of both limbs is the longest. The scales on the 
top of the head are large, juxtaposed, and smooth, and there is a spine at the anterior 
margin of the ear. The nostril is placed slightly above the canthus rostralis, and looks 
upwards and backwards. The naked ear is larger than the eye-opening. The tail is 
laterally compressed, and the scales are strongly keeled. The coloration is completely 
faded. 
The foregoing specimen was from Arabia Petrsea. 
1 Specimens examined. 
