new Species o/Gerbillus and Taterillus. 149 



proectote buffy like tlie general colour. Fore limbs wholly 

 in the white area, without any darker colour on their front 

 surface. Solos less haired than in other members of Gerbillus, 

 the naked area extending from the heel along- the middle 

 of the sole to the level of the base of the hallux, but the 

 region of the pads is closely and profusely hairy, as usual 

 in the genus. Tail at base pale buffy above, whitish below — 

 its terminal portion lost in the type. 



Skull remarkable lor the great size of the bulla:, which 

 tend to recall those of Desmodillus and far exceed those of any 

 other member of this genus. The posterior breadth of the 

 skull is therefore unusually great. Muzzle slender. Supra- 

 orbital beads present. Zygomatic plate more projected 

 forward than in most species of Gerbillus, and almost 

 approaching the projection characteristic of Taterillus ; the 

 same is the case in G. pceba. Palatal foramina, both anterior 

 and posterior, large and well open. Bulla) greatly swollen, 

 the anterior edge of the meatus also inflated ; a well-marked 

 vacuity just beneath the opening of the meatus. 



Dimensions of the type (measured in the flesh) : — 



Head and body 92 mm.; tail (00 + ) ; hind foot 30; 

 ear 15. 



Skull: greatest median length 29; greatest diagonal 

 length 30; condylo-incisive length 27; zygomatic breadth 

 16; nasals 11 "2 ; interorbital breadth 6; breadth of brain- 

 case 14"3 ; breadth between outer edges of meatal inflations 

 16"8; zygomatic plate 4'8 ; palatal foramina, anterior 5*2, 

 posterior 2'5 ; greatest horizontal diagonal diameter of 

 bulla 10*7 ; greatest diameter in any direction 12"2 ; upper 

 molar series 4'2. 



Hab. Bushman-land. Type from Tuin, near Kenhart, 

 Hartebeest River, near 29° S., 21° E. 



Type. Adult male. B.M. no. 12. 1. 11. 2. Presented 

 alive by Maj. H. A. P. Littledale to the Zoological Society, 

 by whom it was transferred on death to the National 

 Collection. 



This well-marked species is readily distinguishable by its 

 greatly enlarged bullae, which tend to approach in size those 

 of Desmodillus auricularis, obtained in the same region by 

 Major Littledale. The hind feet of this animal are also 

 more naked than in other members of Gerbillus, but have, 

 however, the characteristic distal cushion which distinguishes 

 the genus from Dipodillus. 



