PTYODACTYLUS. 61 
nasals only, while the simply swollen nostril is generally denned by the rostral, first 
labial, and three nasals. 
On Suppl. pi. 1 there is an elongated view (fig. 2 2) of the upper surface of the head 
of figure 2, in delineating which evident pains had been taken to give the details of 
the structure of the nostril, which is shown to have been formed by the rostral, first 
labial, and three nasals ; but the shape of the head is not that of the gecko lobe. 
On the Plain of Suez, close to the Sinaitic Peninsula, geckos of this species (PL VI. 
fig. 5) occur with somewhat heavier and more rounded bodies, larger, broader, and much 
less depressed heads, and larger digital disks than the common gecko lobe of Egypt. 
Their nostrils are not tubular, but are somewhat more swollen than in the latter ; and 
in two specimens in my possession from that locality the opening is irregularly and 
asymmetrically defined, as, in both, the rostral is absent on one side of the head and 
present on the other. The tail also is more rounded than in the gecko des maisons. 
It appears to me that it is a gecko of this kind that is represented on Suppl. pi. 1. fig. 2, 
and that the gecko on pi. 5. fig. 5 is the common form with the slightly depressed 
head, slender body, and somewhat smaller disks {vide PI. VI. figs. 1 & 2). The specimen 
of the gecko lobe described by Is. Geoffroy was 5 inches long ; and he states that the 
body and head were depressed and flattened, which is evidence that he was not 
describing a gecko resembling fig. 5 of PI. VI. of this work, as this gecko has a high 
and broad head. As already stated, Audouin regarded the gecko figured by Savigny 
on Suppl. pi. 1. fig. 2 as a variety of the gecko lobe. This so-called variety I suppose 
to have been the equivalent of the Suez geckos. 
When Mr. Boulenger wrote, in 1891, the tubular-nosed geckos and those with merely 
swollen nostrils were represented in the British Museum only by three of the former 
and by two of the latter, whereas there were eight specimens of the Sinaitic and 
Palestine geckos and four geckos from Maskat. He regarded the tubular or much- 
swollen nosed geckos as the typical form. 
In dealing with this species I have had 94 specimens before me : the Nile valley has 
contributed 36, the Sinaitic Peninsula and the Plain of Suez 5, Southern Syria 9, South- 
eastern Arabia 4, the Hejaz 3, Algeria 5, Eritrea (Ghinda) 27, and Shoa 5. 
The geckos found in the Nile valley belong to two groups. The first I shall 
call Phalanx I., and the second Phalanx II. To the first I also refer the geckos 
from the Hejaz, and to the second likewise certain geckos from the Plain of Suez, 
the Sinaitic Peninsula, Syria, and South-eastern Arabia. The geckos from Algeria 
seem to deserve recognition as a distinct variety, as do also those from Eritrea and 
Shoa. 
As the geckos of the first Phalanx represent the gecko first described by Is. Geoffroy 
as Le Gecko lobe, it may be designated " Phalanx typica " ; and as those of the 
second Phalanx embrace geckos conforming more or less to the geckos from Tor in the 
Sinaitic Peninsula named by Heyden P. guttatus, it may appropriately be called 
