7iew Mammals from Lake Chad and the Congo. 383 



orbital breadth 7; length of nasals l-i'7 ; upper molar tooth- 

 row 55. 



J J ah. Rwanda, R. Ubanghi. 



Type. Old male. Original no. 41. Collected by Mr. Boyd 

 Alexander, 25th December, 1U05. 



The species at present known in this genus fall into three 

 well-marked colour-groups, viz.: — (1) general colour without 

 any speckling, either dark brown, as in sikapusi from tlie 

 West Coast and Ansorgei from Lake Victoria, or olive-grey, 

 as in Wvosnaini ; (2) general colour a dark brown, finely 

 speckled with dark butf or cinnamon, as in aquilus from 

 Kilimanjaro and tiie present form ; and (3) general colour a 

 dark brown, coarsely speckled with pale buff or yellow, as 

 m Jiavopunctatus from the extreme north-east of Atrica. By 

 its colouring the present species falls in the aquilus group, 

 but is markedly larger than any form in that grouj), and 

 though it closely agrees in all dimensions with Ansorgei, 

 it is sharply differentiated from all the sikapusi group by 

 its colouring. 



Lophuromys laticeps, sp. n. 



Near L. aquilus; the brain-case broader and lower and 

 the palatal foramina shorter. 



External characters very much as in L. aquilus, though 

 the speckling may be a tritie stronger. General colour of the 

 same warm vandyke-brown above and dull russet below. In 

 a young specimen the posterior back is unspeckled, as in 

 L. sikapusi, and the belly is more strongly tawny. 



Skull shorter and broader than in L. aquilus^ the brain-case 

 peculiarly broad, rounded and low, tlie height from bulla to 

 crown a millimetre or more less than in that species ; ridges 

 practically undeveloped behind postorbital processes ; ante- 

 rior root of zygoma projected forward as in aquilus, not 

 narrow and slanting as in L. Woosnami; palatal foramina 

 unusually short, widely open. 



Dimensions of the type (measured in flesh) : — 



Head and body lOS mm. ; tail (broken, in an immature 

 specimen 54 mm.) ; hind foot 20 ; ear 18. 



Skull : greatest length 29 3 ; basilar length 24 ; zygo- 

 matic breadth 15*2; nasals, length lib; interorbital 

 breadth 63; breadth of brain-case 13'7 ; height of brain- 

 case including bull* lO'G; palatilar length 12; palatal 

 foramina &'2 ; length of upper molar series 5. 



ilnh. Lake Kivu. Alt. 41»()(>'. 



