A neio Spiny Mouse frsm Somaliland, 259 



evenly distributed over the whole dorsal surface. Backs of 

 hands and feet brownish ; toes clothed with whitish hairs. 

 Ventral surface of body dirty white. Tail with terminal 

 half white, in this respect agreeing with C. g. dichrurus. 



Skull like that of dichrurus but rather larger. Posterior 

 emargination of palate well marked. Auditory bullse fairly 

 large. 



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



Head and body 330 mm. ; tail 373 ; hind foot 65 ; 

 ear 40. 



Skull : greatest length 67 ; basilar length 55 ; condylo- 

 incisive length 63 ; zygomatic breadth 33*5 ; occipital 

 breadth 25; length of nasals 26; palatilar length 33*4; 

 length of palatal foramina 5*5 ; alveolar length of upper 

 molar series. 



Ilab. Fika, Bornu, Northern Nigeria. Altitude 1100 feet. 



Ti/pe. Adult male. B.M. no. 11. 5. 12. 9. Original 

 number 35. Collected by P. A. Talbot, Esq., on ilarch ord, 

 1911. 



Three specimens of this new Gricetomys were collected by 

 Mr. Talbot, and, together with several other mammals, pre- 

 sented by him to the British Museum. The collection was 

 obtained during the journey which Mr. Talbot recently made 

 across Nigeria, in company with Miss Olive MacLeod, and 

 it is after Miss MacLeod that the novelty of the collection is 

 named. 



XXX. — A new Spiny Mouse from Somaliland. 

 By Guy Dollman. 



(Published by permission of the Trustees of the British Museum.) 

 Acomys hrockmani, sp. n. 



Allied to Acomys mullah, Thos., but very much paler in 

 colour and rather smaller in size. 



Size and proportions rather less than in A, mullah. 

 General colour of back pale yellowish brown, washed with a 

 light rufous tint, the general effect about as represented in 

 snuff-brown no. 1 washed with yellowish salmon no. I 

 ('Repertoire de Couleurs '). Middle of back, in posterior 

 region, slightly darker than rest of dorsal surface, due to the 

 brown tips of the spines being rather richer in colour, but 

 not approaching the dark brownish coloration met witli in 

 A. mullah. Face, head, and shoulders paler and less rufous 



17* 



