BIAMMALS OBTAINED IN DARFUK. 261 



Skull with proportionally large brain-case and short mnzzle. 

 Bulla fairly large, miich smaller than in Bipodillus henleyi. 



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



Head and body 54 mm.; tail 79; hind foot 17-5; ear 11. 



Skull: greatest length 20-5; condylo-incisive length 17: 

 nasals 7-1 ; breadth of brain-case 10-2; anterior palatine fora- 

 mina 3-2 ; posterior palatine foramina 2-2 ; bulla 7 ; upper molar 

 series 3'2. 



JIab. Plains of Darfur. Type from- 45 miles N. of El Fasher. 



%;7e. Adult female. B.M. No. 23. 1. 1. 169. Original number 

 1078. Collected February 6, 1922. 



This pretty little Gerbil reminds one of the tiny Dipodillus 

 henleyi of Lower Egypt, but the soles, though partly naked 

 behind, are distinctly those of Gei-Ullus, in which genus this is 

 much the smallest species known. 



39. Dipodillus lowei, sp. n. 



6 . 566, 577, 583, 587, 595, 600, 601, 603, 605, 625, 676, 677, 

 678, 679, 684, 685, 975, 979, 981, 986, 990, 992, 995, 1005, 1010, 

 1105. 



$ . 564, 565, 578, 581, 582, 584, 588, 591, 592, 593, 594, 602, 

 604, 618, 620, 624, 674, 675, 680, 681, 688, 689, 693, 694, 906, 

 973, 976, 978, 980, 982, 983, 984, 987, 988, 989, 991, 993, 995, 

 997, 998, 999, 1000, 1002, 1004, 1007, 1008. Jebel Marra. 

 6650-9750'. 



A dark-coloured mountain form of the D. campestris group. 



Size about as in D. campestris. General colour dark, much 

 darker than the clear gerbil-colour of most members of this genus, 

 though occasional or younger specimens of can/pestris are similar.. 

 Back dark bufFy grizzled with the brown tips of the hairs, the 

 general tone near " Brussels-brown," while some specimens even 

 approach sepia. Sides a little clearer buffy. Under surface as 

 usual wholly white. Ears brown, with the conspicuous whitish 

 markings behind eyes and at base of ears. Legs buify brownish ;. 

 hands and feet white. Tail with a fairly well- developed blackish 

 tuft on its terminal third, its hairs ordinarily attaining 8-9 mm. 

 in length ; under surface of tail dull bufiy brownish. 



Skull, on the whole, like that of D. campestris, hut rather more 

 robust, and the zygomatic plate projecting slightly further for- 

 ward, so that its anterior point stands about 3-5 instead of 

 3"0 mm. in front of the base of the notch, as viewed from above. 

 The bullae are of about the same length, but, apparently owing'to 

 a less convex inner side, the slit between them and the front part 

 of the basioccipital is nearly invariably broader. Molars slightly 

 heavier. 



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



Head and body 110 mm. ; tail 143 ; hind foot 25-5 ; ear 17. 

 Proc. Zool. Soc— 1923, No. XVIII. 18 



