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 bullae 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 laminae 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 o'O ; 

 length of upper molar series 5*1 ; greatest diameter of bulla 

 10 ; vertical height of brain-case and bulla combined 12'2. 



Hob. 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. 



Gerhillus Emini, 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. 



