new African Mammals. 229 



Skull broad and stoutly built, zygomatic arches widely 

 spread, the zygomatic breadth being rather greater across 

 the squamosal region (14 - 7 mm.) than across the maxillary 

 region (14*1 mm.). Nasals fairly broad anteriorly, narrowing 

 posteriorly. Brain-case as described above. Palatal fora- 

 mina short, terminating posteriorly about 1 mm. in front of 

 the anterior level of the molar series. Auditory bulla? small 

 and rather flat. Teeth as described above. 



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



Head and body 59 mm. ; tail 99 ; hind foot 15 ; ear 12. 



Skull: greatest length 24 j basal length 20*7; condylo- 

 basal length 22*5; basilar length 19*2; condylo-basilar 

 length 21; zygomatic breadth 14*7 ; interorbital breadth 4'9; 

 breadth of brain-case (behind squamosal region) 11*3 ; nasals, 

 greatest length 8*3, greatest breadth 2*7, least breadth 1'3 ; 

 palatal length 12*4 ; palatilar length 11 ; width of palate, just 

 anterior to inner cusps of m\ 3'2 ; length of palatal fora- 

 mina 3'7 ; post-palatal length 8 ; length of upper cheek- 

 teeth 4*6 ; length of m 1 2'7 ; length of m 2 1*7 ; length of 

 upper incisors 3*3. 



Hab. Bitye, Ja River, Cameroons. Altitude 2000 feet. 



Type. Adult male. Original number 506. Collected by 

 Mr. G. L. Bates on February 21st, 1910. 



I have named this interesting mouse after the collector, 

 Mr. G. L. Bates, whose name is already associated with so 

 many remarkable West African mammals. 



Acomys igm'lus, sp. n. 



Allied to Acomys selousi, de Wint., but larger and very 

 much brighter in colour. 



Size and general proportions much as in A. mullah, Thos. ; 

 tail rather shorter, about equal in length to that of 

 A. witherbyi, de Wint. Ears comparatively small. Texture 

 of pelage about as in A. witherbyi, slender, rather spinous 

 hairs on head, shoulders, anterior back, flanks, and entire 

 ventral surface, and broad, flattened spines on the rump and 

 posterior back. General colour of upper surface brownish 

 orange, becoming brighter in colour on the flanks (dead leaf 

 no. 1 mixed with tan colour no. 1, ' Repertoire de Oouleurs '). 

 Line of demarcation between the reddish flanks and white 

 ventral surface sharply defined. Flattened spines of poste- 

 rior back slate-grey, turning orange towards the tips, the 

 extreme tips brownish. Spinous hairs on flanks with light 

 slate-grey bases, buffish towards the middle and deepening to 

 reddish orange in the terminal portions. Backs of hands and 



