504 ZOOLOGICAL EESULTS OF THE EIJWENZOEI EXPEDITIO]Sr. 



Skull: greatest length 33; basilar length 26-5; zygomatic breadth 16; brain-case 

 breadth 13"6 ; diastema 9; palatal foramina 7-6; upper molar series, length 5-3, 

 breadth 1-7. 



Type. Old male. B.M. no. 6.7.1.97. Original number 18. Collected 2nd January, 

 1906, by Mr. K. E. Dent. 



A series of 13 specimens, including males and females, examined. The type of 

 M.jacksoni is unfortunately a quite young animal, but, so far as we can judge, 

 it is a somewhat smaller animal even when full-grown, otherwise externally it 

 closely resembles the present species. On comparing the skulls, however, the size of 

 the teeth sei'ves to separate them at once, the measurements in M. jacJcsoni being — 

 length of upper molar series 4'6, breadth 1"4. 



[Extremely common on Kuwenzori everywhere up to 8000 ft. They were most 

 numerous around the native huts. — R. B. W.] 



59. Mus DENNIS Thos. 



d. 36, 77, 223, 228, 235, 239, 253, 640. ?. 242, 258, 639; 123, 126. 

 Mubuku Valley, E. Euwenzori. 6000-12,000 ft. 



$ in spirits. Mubuku Valley, E. Ruwenzori. 7000 ft. 



A small long-tailed species allied to M. cdleni. Mammse 2 — 2 = 8, 



Size about as in M. cdleni and M. carillus. Fur soft and rather woolly ; hairs of 

 back about 9-10 mm. in length. General colour not unlike that of M. carillus, soft 

 buffy-fawn, varying a good deal in the richness of the tone. Sides clearer and more 

 buffy. Under surface well defined whitish, sometimes tinged Avith buiFy. Head 

 greyer than back ; lower part of sides of muzzle white ; area around eyes black. Ears 

 large, naked, dark brown throughout. Upper surface of hands and feet thinly haired, 

 dull whitish. Tail much longer than head and body, fairly well haired terminally, 

 greyish-brown throughout. 



Skull of the same delicate shape as in M. alleni and M. carillus, and the 

 zygomatic plate similarly little projected forward. Supraorbital edges sharply 

 square, but not beaded. Palatal foramina much longer than in the two western 

 species. 



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



Head and body 96 mm. ; tail 154 ; hind foot 21 ; ear 21. 



Skull: greatest length 27 ; basilar length 22-5; greatest breadth 13-5; nasals 9-5 ; 

 interorbital breadth 4-1 ; breadth of brain-case 12-2 ; palatilar length 12 ; diastema 8 ; 

 palatal foramina 6"4x2"3 ; length of upper molar series 4. 



Type. Male. B.M. no. 6.7.1.112. Original number 235. (7000 ft.) Collected 

 15th January, 1906, by Mr. Douglas Carruthers. 



This pretty Mouse is no doubt allied to Mus alleni., with which it shares the general 



