78 On Three new Gerbilles in the British Museum. 
General colour above bright rich rufous, darker along the 
centre of the back, clearer and richer on the sides. Under 
surface from nose and cheeks to anus, forearms all round, 
hands and feet, white, the line of demarcation sharply marked. 
Tail brown above, dull yellow on the sides and below ; the 
lengthening of the upper brown hairs forming the usual crest 
and pencil commencing on the proximal third of the tail. 
Skull narrow, but with rather a stout muzzle; its general 
form more Murine than Meriones-like, as the posterior part is 
narrow, and no part of the bullee show in a vertical view of 
the skull. These latter are small, oval, and have their 
mastoid portion scarcely swollen at all. 
Teeth: upper incisors very much bevelled, with a single 
deep groove. Molars markedly Gerbilline in the strictest 
sense, their lamine low, separate from each other, and evi- 
dently each originally composed of two cusps, with the usual 
exceptions of the anterior lamina of the first and the posterior 
of the last molar. 
Dimensions of the type (an adult male in spirit) :—Head 
and body 92 millim.; tail 134; hind foot 29; ear 15°5. 
Skull: basal length 25°5; greatest length from tip of 
nasals to occiput 32; zygomatic breadth 15:7; breadth at 
anterior edge of auditory meatus 14°9; nasals, length 12:4, 
greatest breadth 3-2; interorbital breadth 5:9; interparietal, 
length 4°4, breadth 8°5; length of anterior zygoma-root 5'1 ; 
palate, length 16:2, diastema 7:7, palatal foramina 5:0; 
length of upper molar series 5'°1; greatest diameter of bulla 
10; vertical height of brain-case and bulla combined 12-2. 
Hab, Gambia. 
Type specimen (85. 2. 2. 1) collected and presented to the 
Museum by Sir C. A. Moloney. 
This pretty little species appears to be most nearly allied 
to G. leucogaster, Peters, which is found from Mozambique 
across to Angola, and to the Algerian G. garamantis, Lataste. 
The former of these, however, is considerably larger than G. 
gracilis, while the latter, besides being much smaller, has five 
instead of only four hind foot-pads. 
Gerbillus Lmint, sp. n. 
Size slightly larger than in G. gracilis, markedly smaller 
than in the large species and larger than in the small ones 
described by Sundevall, Heuglin, and others from the same 
region. 
Colour above a soft brownish fulvous, finely grizzled with 
black, paler on the sides. Lower surface, hands, and feet, 
as usual, pure white. 
