AGAMA SINAITA.. 109 
A. armaria, Heyden, is represented in the Frankfort Museum by the two types from 
Upper Egypt, presented by Kuppell. They do not appear to me to differ from 
A. sinaita, except in having their dorsal scales a little more strongly keeled. In both 
there are seven praeanal pores. 
The females from the Hadramut have distinct praganal pores, also those from Suez 
and Heluan. 
The specimens of this species from Lower Egypt also illustrate its variations. I 
have met with it, as I have said, only on the Plain of Suez and in the desert (Wadi 
Hoaf) at Heluan. The lizard from the former locality has its dorsal scales practically 
smooth, whereas those from the latter have distinctly keeled scales. The specimens in 
the British Museum referred to A. arenaria, Heyden, and also from Egypt, exactly 
resemble the lizard from the Plain of Suez ; whereas two specimens in the British 
Museum from Mount Sinai, and referred to A. sinaita, Heyden, correspond to one of 
my Heluan lizards, a young individual 
The adult female from Heluan (Wadi Hoaf) has the mesial line of dorsal scales very 
slightly, if at all, enlarged, considering the fact that in all- specimens belonging to one 
or other of these varieties the scales gradually diminish in size towards the sides. In 
this specimen, however, the scales are decidedly imbricate and distinctly keeled. On 
the other hand, in the specimen from the Plain of Suez the scales are only feebly 
imbricate, and carination is all but completely lost. The mesial dorsal scales hold 
almost the same proportions to the lateral scales as in the Wadi Hoaf female. In 
both of these specimens, and in the Hadramut examples as well, the ventrals do not 
vary in size. As a rule, the Hadramut specimens have the mesial dorsal scales 
decidedly larger than the ventrals, and all have distinctly keeled scales, but, among 
some of them, the difference in size between dorsals, laterals, and ventrals graduates 
in the same way as in the Wadi Hoaf female. 
In view of these facts, and the exact similarity of these lizards in the other details 
of their external structure, the differences I have pointed out can only be regarded as 
illustrative of variation, but they present no stability to entitle them to varietal rank. 
It is only another example of the remarkable modifications to which the scales of many 
species of the genus Agama are subject. 
