the Genera Tatera and Taterillus. 293 



b'. Head and body 120 mm. ; hind foot 29 ; 

 skull 34 ; brain-case 15 ; molars 5. 

 General colour " vinaceous cinnamon." 



(Bahr-el-Gbazal.) T. butkri, sp. n. 



c'. Head and body 120 mm. ; bind foot 31 ; 

 skull 36 ; brain-case 16 ; molars 5. 



(B. E. A.) T. osgoodi, sp. n. 



b. Colour paler. Head and body 120 mm. ; 

 hind foot 30 ; skull 37 ; brain-case 145 ; 

 molars 5*2. General colour " ochraceous 



buff." (Lake Chad.) T. lacustris, Th. & Wr. 



B. Size smaller. 



a. Head and body 100 mm. ; hind foot 28 ; 



skull 31 ; brain-case 14 ; molars 4-5. 

 General colour " clay colour." (Lake 

 Rudolf.) T. harringtoni, Thos. 



b. Head and body 92 mm. ; hind foot 29 ; 



skull 32; brain-case 14; molars 5"1. 



General colour Mars-brown. (Gambia.) T. gracilis, Thos. 



Taterillus osgoodi, sp. n. 



A Taterillus about the size of T. emtni, distinguished by 

 its darker colouring and broader stouter skull. 



Size about as in T. entini. General colour above ferrugi- 

 nous russet, becoming more purely ferruginous on the flanks, 

 individual hairs blackish slate basally (10 mm.), then ferru- 

 ginous (2*3 mm.), with a sharp black tip ; below pure white. 

 Hands and feet white. A band of a few scattered short pale 

 hairs across the tarsus behind the hallucal pad. Proximal 

 half of tail clothed with short ferruginous hairs, darker above, 

 paler below, distal half furnished (especially above) with long 

 (10 mm.) blackish-brown hairs forming a long tuft. 



Skull of the same size as in emini, but much broader and 

 stouter, the characteristic long posterior palatal foramina 

 fairly well developed. 



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



Head and body 117 mm.; tail 150; hind foot 31; ear 

 17-5. 



Skull : greatest length 36*5 ; basilar length 27 ; zygo- 

 matic breadth 18 ; nasals 15 ; least interorbital breadth 6 ; 

 brain-case breadth 16'5; diastema 10; anterior palatal fora- 

 mina 5*5; posterior palatal foramina 4; upper molar series 

 4-8; bullae 10-3. 



Hal. British East Africa (Type from Voi. Alt. 2000'.) 



Type. Adult male. Rudd Collection. Original number 

 958. Collected on 16th April, 1910. 



Mr. Kemp sent a series of seven specimens. 



