384 Messrs. O. Thomas and R. C. Wrougliton on 



Type. Adult female in British Museum. Original num- 

 ber '318. Collected 29th November, 1906, by Douglas 

 Carruthers. A second (immature) specimen from the 

 Mfumbiro volcanoes. 



This species is no doubt closely allied to the common 

 L. aquilns of British East Africa, but may be distinguished 

 by its differently shaped brain-case and shorter palatal 

 foramina. 



Thryonomys Harrisom, sp. n. 



A Thryonomys of the gregorianus-Sdateri group, more 

 closely allied to the former ; the remarkable postorbital pro- 

 cesses so characteristic of the latter entirely absent. 



Size, judging from the skulls, rather larger than in 

 gregorianus. 



As compared with the skull oi gregorianus that of Harrisoni 

 is markedly longer and narrower ; the frontal depressions less 

 marked ; postorbital processes even less developed ; the 

 lacrymal bone smaller and the anterior edge of malar broader, 

 so that the distance between these two bones is very markedly 

 smaller, scarcely more than one third the same distance in 

 gregorianus; the nasals longer and the portion of the pre- 

 maxillary flanking them narrower. The following measure- 

 ments taken on the type skulls of the two species demonstrate 

 these differences very clearly : — 



Harrisoni. gregorianus. 



Greatest length 91 82 



Greatest breadth 52 54 



Nasals, length 30 26'5 



Frontals, length 2o-5 23 



Interorbital breadth 28-5 30 



Greatest width of rostrum posteriorly, I gg 24 



across premaxillaries ( ~ 



Posterior breadth of nasals 13 13 



Distance on the orbit between malar I ^.^ g 



and lacrymal ( 



Upper molar series .... 16 16 



Hah. Loka, 60 miles S.W. of Fort Berkeley, Lado 

 District. 



Tyin. Skull and imperfect skin. B.M. no. 4.9.28.2. 

 Collected and presented by Col. J. J. Harrison. 



Lepus chadensts, sp. n. 



A very pale-coloured long-eared hare of rather large size. 

 Size rather larger than in cethiojncus, Hawkeri^ &c. 



