Mammals from the Dinha Country, Bahr-el-Djebel. 101 



28. A corny s wilsoni argillaceus, subsp. n. 



38. Mongalla. 



? . 108. Bor. 



Type.—BM. 20. 4. 2G. 15, original no. 38. Collected 

 2nd June, 1918, by Major Stevenson Hamilton j presented 

 to the National Collection by the Wellcome Research 

 Laboratory. 



Captured in scrub and undergrowth. 



Size a little less than in Acomys wilsoni, Thos., from which 

 it also differs in its less rufous colouring. Spines thick, 

 annulated, their extreme tips being " seal-brown," succeeded 

 by a broad band of " clay-colour," which is followed by 

 " grey " (no. 6, Ridgway) to the base. General colour very 

 similar to that of A. w. ablutus, Dollm., but lighter owing to 

 the clay-coloured annulations being broader in our animal. 



Skull very much as in A. wilsoni, conspicuously larger 

 than in A, w. ablutus. 



Dimensions of the type (measured in the flesh) : — Head and body 

 76 mm. ; tail 51 ; hind foot 12 ; ear 10. 



Skull, type and no. 108 (in parentheses) : condylo-incisive length 22-4 

 (23-2) ; occipito-nasal length 24'6 ( — ) ; zygomatic breadth 12-1 (12-1) ; 

 interorbital constriction 4'5 (4-5); breadth of brain-case 11-1 (11"1); 

 length of anterior palatal foramina 6 (5*7) ; dental length 11'8 (12) ; 

 molars (crowns) 3 - 5 (3*8). 



Remarks. — This member of the wilsoni group is geographi- 

 cally isolated, its nearest neighbours on the north and south 

 being A. loitherbyi and A. hystrella, from both of which it 

 differs widely in size and colour. 



29. Arvicanthis abyssinicus rubescens, Wr. 



S . 6, 7, 8, 959 ; ? . 3, 5, 10, 11, 12, 13, 14, 30, 45, 46, 

 124. Mongalla. 



<?. 103, 105, 123, 126; ? . 104, 135, 137. Bor. 



30. Lemniscpmys zebra, Heugl. 



cJ. 16, 19. Badigeru Swamp, 20 miles east of Mongalla. 

 S . 62. Mongalla. 

 ? . 121. Rejaf. 



