154 



Mr. G. Dollman on the 



or "liumped" skull, the iiiterorbital rep;ion being raised up 

 into a regular liunip, from wliicli point the nasals slope 

 markedly dowmvards anteriorly, and similarly the cranial 

 refijion posteriorly, the interorbital or frontal anj^le so formed 

 l)eing most conspicuous ; owing to this feature the depth 

 from the liighest point of the orbit to the alveolar border is 

 very great. The general colour is given by Osgood as 

 "from pale cinnamon to wood-brown"; specimens in the 

 Museum Collection identified by the describer seem to agree 

 with this description quite closely. Behind the cars is a 

 conspicuous patch of creamy buff, a feature well developed in 

 the following race. Hands and feet cream)' buff. Uudcr- 

 ])arts slate-grey washed witii brown. 



Skull : in addition to the curious arched character men- 

 tioned above, the nasals are rather narrow posteriorly, of the 

 same spoon-shaped pattern as those of trojncalis. m^ with 

 7 laminre. 



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



Head and body 184 mm.; tail 98; hind foot 30*5; 

 ear 24. 



Skull : greatest length 43*3 ; basilar length 34*6 ; zygo- 

 matic breadth 21-7 ; length of nasals 20*7 ; greatest breadth 

 of nasals 7"5; interorbital constriction 3'4 ; depth from 

 highest point of orbit to alveolar border at front of vi^ 14'5 ; 

 postpalatal length 15*1 ; palatal tbramina 7*5 ; length of 

 upper molar series 9*2; greatest width of m^ 2*5. 



Hah. Molo, British East Africa. 



Type. Adult female. In Field Museum of Natural 

 History, no. 16698. 



(4) Otomys tJiomasi malleus, subsp. n. 



Allied to 0. thomasi, Osg., smaller in size and paler in 

 colour. 



General proportions conspicuously less than in thomasi. 

 Colour of dorsal surface pale ochreous buff suffused with 

 brownish on the back, the jzeneral effect paler and greyer 

 than in the Molo form. Flanks pale buff. Head and 

 muzzle similar in colour to back, cheeks pale buff. Light 

 Hreas behind ears much as in thomasi, hut not so prominent. 

 Backs of hands and feet light greyish white washed with 

 pale buff. Underparts of body slate-grey overlaid with pale 

 buff. Tail greyish white tinted with huff. 



Skull of the same arched tyne as that of thomasi, but 

 decidedly smaller and with much shorter nasals. 



