256 
THE MAMMALS OE EGYPT. 
Measurements taken from specimens in alcohol. 
Head and body 
Tail .... 
Hind foot . . 
Ear .... 
Abu Eoash. 
_ 
6 . 
mm. 
107 
153 
34. 
17 
cJ. 
mm. 
113 
155 
33-5 
17 
$• 
mm. 
93 
134 
33 
15 
Measurements of skulls. 
Greatest length. 
„ breadth .... 
Least supraorbital constriction 
Length of nasals .... 
Basal length. 
Length of incisive foramina . 
,, molar series. . . 
Gizeh. 
d. 
?. 
mm. 
mm. 
113 
100 
156 
138 
33-5 
32-5 
16-5 
15 
Abu Eoash. 
Near Cairo, 
mm. 
mm. 
36 
35-5 
19-5 
18-5 
7 
7 
14-5 
14 
30-1 
29-5 
7 
6-1 
5 
4'6 
Habits much the same as the last species. 
Arabic, ‘ Dimsi.’ 
Gerbillus pygargus, F. Cuv. 
Meriones gerbillus, Cretzschm. Riipp. Atlas, 1828, p. 77, pi. 30. fig. b. 
Gerbillus pygargus, F. Cuv. Trans. Zool. Soc. ii. 1838, p. 143, pi. 35. figs. 10—14. 
(?) Gerbillus burtoni, F. Cuv. Trans. Zool. Soc. ii. 1838, p. 14o, pis. 22, 33. 
(?) Meriones venustus, Sundev. Vet.-Ak. Handl. Stockh. 1843, p. 230, tab. ii. fig. 2. 
(?) Meriones dongolanus, Heugl. Reise N.O.-Afr. ii. 1877, p. 79. 
c? . General Sir C. Holled Smith. Suakin. 
2 . Major Penton, R.A.M.C., D.S.O. Suakin. In alcohol. 
4. Plain of Tokar. In alcohol. 
7. Plain of Suakin. In alcohol. 
Rather smaller than G. fyramidum, and dilfering from that species in its lighter and 
brighter colour, owing to the almost entire absence of the dark tips to the hairs on 
the dorsal region. The black ring round the eye and the dark streak behind the 
eye are also absent. The half- or three-parts-grown young may be distinguished from 
specimens of G. gerUllus by the grey of the under-fur showing on the surface. The 
soles of the hind feet of this species are even less covered with hair than those of 
G. pgramidum. 
