1902.] MAMMALS FROM TRIPOLI. 7 



style. It is to be hoped that they may be soon further supple- 

 mented. 



8. DlPODILLUS DODSONI, sp. n. 



6.8.9. W. Nefed. 14-15/4/1. 



18. 21. 22. 23. 25. 29. Ain Hammam. 27-29/4/1. 



34,37.39. Tamari-Ferdjan. 5/5/1. 



46. 50. 55. Omn el Abid. 1 1-14/5/1. 



68. Grodua. 23/5/1. 



79.83.84. Shup. 8-10/6/1. 



100. Ain Hammam. 24/6/1. 



100. W. Agarib. 1/7/1. 



Essential characters of D. campestris, Imt largei-, more desert-' 

 coloured, and with a longer and more heavily tufted tail. 



Size larger than in the true D. campestris of the coast-lands. 



Fur longer and looser. Genei-al colour above sandy buff, 

 varying from light ochraceous buff to a dull Isabella. Usual 

 orbital and postauricular white patches present. Under surface 

 pure white, the line of demarcation less sharply defined than in 

 the closer-haired D. campestris. Ears of medium size, naked ; 

 clear greyish. Hands and feet white ; palms and soles naked ; 

 six sole-pads present. Tail very long, heavily tufted in its 

 terminal half, the hairs of the tip attaining about 15 mm. in 

 length ; its base saiidy above, white below, the tuft bi'own above, 

 duller white below. 



Skull quite like that of D. campestris, but rather larger in all 

 dimensions. 



Measurements of the type : — 



Head and body 101 mm. ; tail 143 ; hind foot 28 (range 26-29) ; 

 ear 15. 



Skull — greatest length 31 ; basilar length 22"2 ; zygomatic 

 breadth 16'5; length of nasals 12; interorbital breadth 5'1 ; dia- 

 stema 8 ; palatal foramina 5'5 ; upper molar series 4*1. 



Typical locality. Ain Hammam. 



Type. Adult male. Original number 29. Killed 29 April, 

 1901. 



This fine tufted-tailed Gerbille is the representative of D. cam- 

 pestris south of the Atlas, and was not distinguished by Lataste 

 from that species. But the true D. campestris of the coast-lands 

 of Algeria is rather smaller, much browner in colour, and its tail 

 has far less tuft than B. dodsoni. The type locality was Philippe- 

 ville, on the coast of Oonstantine, and examples from the coast as 

 far westward as Mogador practically agree with those from this 

 district. On the other hand, on the sovith side of the mountains, 

 desert Algerian examples, obtained by Mr. Eaton at Biskra, ai-e 

 referable to the Tripolitan D. dodsoni. 



Of the four species of Loche and Levaillant said Avith doubt 

 by Lataste to belong to the campestris group : — 



No. 69, Gerhillus deserti, is clearly not this species, being far 

 too short-tailed. It is perhaps a young G. hirtipes or G. simoni. 



