40 THE EEPTILES OF EGYPT. 
specimen should occupy, but it evidently stands between the Gizeh geckos and those 
found in the delta and other localities, and that conform more or less to S. maur it aniens. 
As regards the digits, those of the Gizeh geckos are not quite so slender as those of 
the type of S. wilkinsonii and of the geckos from Middle and Upper Egypt ; but as 
variations in these respects are frequent, little or no importance need be attached to 
them. On the other hand, the digits of the type of S. mauritanicus, and of those 
associated with it, are generally stouter than in the others, and in some cases they are 
very markedly so (fig. 5, PI. IV.), but other specimens have digits differing but little 
from those of S. wilkinsonii. 
The nostril in the geckos found at the Pyramids of Gizeh is, without exception, 
defined by the rostral, first labial, and three nasals ; but there are some cases in which 
the rostral feebly approaches the nostril, so that it is difficult to say whether or not it 
enters it. In the type of 6'. wilkinsonii the rostral is excluded, and the nasal formula 
is 1st labial, 3 nasals. This arrangement prevails among seven out of nine specimens 
which I have grouped along with S. wilkinsonii. In one of the nine the rostral enters 
on one side into the formation of the nostril, while in another specimen the nasal 
formula is E.. L. 3 N. In this individual we have thus all the characters of the 
nostril of the Gizeh and Algerian geckos. 
In the type of S. elegans (Nubia) the nostril is formed the same way as in the 
Gizeh geckos. 
In the geckos around the Pyramids of Gizeh the upper labials vary from 10 to 14, 
and the lower from 9 to 12. 
In wilkinsonii, on the other hand, the former are 14, and the latter 11, and in other 
specimens that may be associated with it the upper labials vary from 12 to 15, and the 
E.g. 2. 
Stenodactylus elegans, Eitz. 
S. mauritanicus, Guichenot. Oran, Algeria (Professor Douraergue). 
lower from 11 to 13. In the type of S. elegans there are 14 or 15 upper and 
12 or 13 lower labials. In the type of S. mauritanicus there are 9 upper and 8 to 10 
lower labials; and in a specimen from Oran there are 12 upper and 11 lower labials. 
