new African Epimys ««</ Jaculus. 483 



of tlie main cusp of the first lamina of »«'. Bullas quite 

 small, conspicuously smaller than in any of the luembtTd of 

 the liindei group. 



iAIolars proportionally large, larger than those of E. hindd 

 and equalling those of E. norm; their form and structure 

 quite as in those species. 



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



Head and body 126 mm.; tail 139; hind foot 28; ear 20. 



{Skull : ;T,eatest length 3.5; condylo-incisive length 31*7 ; 



zygomatic breadth 16-7 ; nasals 13-t3 ; interorbital breadth .5 ; 



breadth of brain-case 14*2; palatilar length 1,5-1; pal ital 



foramina 8*2; upper molar series G"7. 



Hah. Kabwir, Buuchi Province, Northern Nigeria. 

 Air. 2700'. 



Type. Adult female. B.M. no. 13. 2. 5. 7. Original 

 number 47. Collected 18th November, 1912, and prese"ited 

 by Mr. J. (^. Fox. 



No rats of this type have hitherto been found in any part 

 of West Africa, and the present species can only be compared 

 with E. hhide i aud its allies, natives of British East Africa 

 southwards to Zambesia. From any of these it is at once 

 distinguishable by its much smaller size and smaller bulhu, 

 though tlie fact that its teeth are as large tends to show tliat 

 it is really related to them. 



Jaculusjaculus favonicuSy subsp. n» 



A western race of the smaller N. -African Jerboa. 



ISize slightly smaller than in Algerian specimens of J. ja~ 

 cuius, about equal to that of Egyptian examples. C<dour 

 more ochraceous than \\\ jacnlus, but this may be due to the 

 preserving Huid out of which the specimen has been skinned 

 — the tone between " pinkish buflE '' and '' ochraceous butf." 

 Breadth of the dorsal colour less across the shoulders than in 

 jaculus, the white of the flanks coming high up on each side, 

 narrowing the dorsal butfy colour to about the width of the 

 crown ; on the hinder back, however, the breadth of the 

 upper colour is as usual. A large white patch behind each 

 ear. Tail buffy above, white below, a well-marked whitish 

 ring preceding the usual subterminal black ring. 



Skull smaller than that of specimens from Biskra and the 

 Central Algerian Sahara, the h\i\\x noticeably smaller in all 

 dimensions ; skulls from Lower Egypt and Somaliland are, 

 however, of similarly small size (see below). 



Dimensions of the type (measured on a spirit-specimen) : — 



Head and body 98 mm. ; tail 175; hind foot 58 ; ear 19. 



