hitherto referred to the Genus Paraxerus. 35 



Under surface greyish, with but little olive infusion. Tail 

 slender, its edges ochraceous yellow. 



Hind foot of type 30 mm. 



Skull: greatest length 355; upper tooth-series exclusive 

 of p 3 5-7. 



Bab. Meridi, Bahr-el-Ghazal. 



Type. Adult male. B.M. no. 17. 10. 4. 4. Original 

 number 5. Collected January 1916 and presented by Major 

 Cuthbert Christy. Four specimens. 



A paler northern form of T. emini. The genus had not 

 been previously recorded from the Nile drainage-area. 



3. Tamiscus vulcanorum, sp. n. 



Size rather smaller than in T. emini. General colour 

 rather brighter and more yellowish olivaceous, with strongly 

 contrasted stripes. Edges of ears (proectote and antitragus) 

 lighter than general colour of head. No white spot on sides 

 of neck behind ears. 



Incisors slenderer than in 7. emini, their antero-posterior 

 diameter about 1*4 mm.; generally more proodont * than in 

 emini. Molars small. 



The members of Tamiscus from Ruwenzori southwards, as 

 represented by specimens from three different places, all differ 

 from T. emini by their light-edged ears and certain other 

 characters which indicate differences from that animal. But 

 while the specimens from each locality are closely similar 

 inter se, it is difficult to name any character except that of 

 the ears which will distinguish the whole of them from emini. 

 Further material from their somewhat inaccessible habitats 

 will be needed before their true relationships can be worked 

 out ; but I would provisionally consider them as one species 

 with three subspecies, as follows : — 



3 a. Tamiscus vulcanorum vulcanorum. 



Fur long, soft, and rich ; axillary patches not naked, 

 practically hidden by thin fur. General colour of head and 

 flanks near " dull citrine/' Black stripes glossy black, the 

 inner pair broad, broader than the yellowish median line 

 between them ; the outer pair narrow, little developed, 

 shorter both in front and behind than the white stiipes internal 

 to them. Under surface washed with yellowish green 

 ("pyrite yellow "). 



* The words proodont, orthodont, and opisthodont (on the analogy of 

 prognathous &c.) might be suggested to express the set of rodent incisors, 

 thrown forward, upright, or turned in backwards respectively. 



3* 



