592 0)1 new African Rodentn. 



Dimensions of the type (measured in flesh) : — 



Head and body 85 mm.; tail 102 ; hind foot 17; ear 1-4. 



Skull : greatest length 24' 1 ; condylo-incisive length 21*7 ; 

 nasals 7'7 ; interorbital breadth 4*6 ; breadth of brain-case 

 11-6 ; palatilar length 10'6 ; diastema 7 ; palatal foramina 5'1 ; 

 upper molar series 4*5. 



Hah. Bitye, Ja Iliver, S.E. Cameroons. 



T7/pe. Adult female, B.M. no. 11. 5. 5. 11. Original 

 number 517. Collected 29th October, 1910, by Mr. G. L. 

 Bates. Another, younger, specimen obtained in 1901 at 

 Efulen, Cameroons. 



Like as this pretty little mouse is to E. alleni and E. stella 

 externally, the resemblance is only superficial, and its large 

 jS^yctoin^s-Uke brain-case, well-defined supraorbital ridges, 

 and larger molars separate it readily from those species. 



Georychus hummi, sp. n. 



Near G. ocliraceo-cinereus. 



General external appearance as in G. lecliei. Size rather 

 smaller. Fur of medium length; hairs of back about 7 mm. 

 Colour slaty gre}', rather less brown than in G. lecliei, not 

 in any way sandy or " ochraceous." Coronal white spot 

 smaller than in lecliei, and not extended posteriorly as a white 

 'line on the nape. Belly with a white median line. 



Skull very much as in G. ocliraceo-cinereus, smaller than 

 that o£ G. lechei ; nasals not expanded mesially, their sides 

 ])arallel from front nearly to back ; orbits defined behind by 

 strongly marked postorbital processes, interorbital breadth 

 slightly less than intertemporal. Lambdoid crest well 

 developed, continued directly across skull without the median 

 anterior inflection so marked in lecliei. Postero-external 

 iingles of zygomata strongly marked. Diastema compara- 

 tively shoit. BulUe small. 

 Dimensions of the type : — 

 Hind foot (s. u.) 29 mm. 



Skull : condylo-basal length 42-4 ; condylo-incisive length 

 44*6; zygomatic breadth 31*5; nasals 15'2xo*2; inter- 

 orbital breadth 9 ; breadth across postorbital processes 13 ; 

 intertemporal breadth 9*2 ; mastoid breadth 20*8 ; palatilar 

 length 24'7 ; diastema 12'6 ; upper tooth-series (crowns) 7*7. 

 Hah. French Shari Protectorate, about 8° N., 22° E., on 

 the Ironstone Plateau. Alt. 2000'. 



Ty^ye. Old female. B.M. no. 11. 4. 2. 1. Collected and 

 presented by Di'. H. Karl W. Kumm, of the Soudan United 

 Mission. 



