546 Mr. 0. Tliomas on 



nasals 15"5x58; brain-case 20xl8"3 ; upper molar series 

 9-4; length of bulla 10. 



Hab. iMt. Kilimanjaro. Alt. 5000'. 



Type. Adult female. B.M. no. 89. 3. 8. 5. Collected and 

 presented by H. C. V. Hunter, Esq. Five specimens. 



Distinguishable from the last species by its linear sagittal 

 crest, and from the next by its more abruptly and widely 

 expanded zygomata. 



Tachyoryctes ruddi, sp. n. 



Size as in T. damon. Sagittal crest linear, more developed 

 than in that animal. Nasals narrow, often barely broader 

 anteriorly than halfway back, a well-marked re-entrant curve 

 on each side. Zygomata not widely expanded anywhere, 

 and the expansion very gradual, so that there is scarcely any 

 perceptible shoulder on each side. Bullae and molars rather 

 smaller than in T. ddemon. 



Colour dark, an unusual proportion of specimens 

 plumbeous. 



Dimensions of the type (measured in flesh) : — 



Head and body 185 mm. ; tail 65 ; hind foot 26. 



Skull: condylo-basal length 42"6 ; zygomatic breadth 31; 

 nasals 18x5'5; brain-case 19x18-5; upper molar series 

 7-8 ; length of bullse 93. 



//g6. Kirui,Elgon, British E.Africa. Alt. 6000'. Other 

 specimens from Mumias. 



Type. Old male. Rudd Collection. Original number 183. 

 Collected 3rd September, 1909, by R. Kemp. Twenty 

 specimens. 



This Elgon species is distinguishable from that of Mt. 

 Kilimanjaro by the uniformly less marked anterior expansion 

 of its zygomata. 



I have named it in honour of Mr. C. D. Rudd, of whose 

 collection it forms a part, and to whom I am indebted for 

 the privilege of describing it. 



Tachyoryctes ruddi badius, sp. n. 



Essential characters of ruddi, but the colour, instead of 

 averaging darker than usual, is brighter than in any other 

 known form, a bright tawny-russet. Below, agaiu, instead 

 of being almost wholly blackish, the hairs are broadly tipped 

 with tawny. Ears, feet, and tail silvery, with a slight 

 fulvous tinge. 



Skull-dimensions of type : — 



Condylo-basilar length 43*5 mm. ; zygomatic breadth 33*5 ; 

 nasals 17'2x 6'2; upper molar series 86. 



Hab. Eldoma Ravine, Brit. E. Africa. Alt. 7200^. 



