Mammals from the Upper Congo. 467 



Coloration and general characters as in true demidoffi, but 

 skull averaging larger. 



Size distinctly larger than in demidoffi, smaller than in 

 the Ruwenzori and Uganda thomasi. General colour above 

 near Prout's brown, but very variable, rarely so bright as in 

 demidoffi or so dull as in thomasi, but the series shows all 

 stages between the two. Under surface always washed with 

 yellowish, not more or less white as in poensis. 



Skull larger than in demidoffi, about equalling that of 

 poensis, smaller than in thomasi. 



Dimensions of no. 1214, the type, $ (taken on the skin) : — 



Head and body 150 mm.; tail 193; hind foot 50. 



Skull : greatest length (occiput to gnathion) 39'3 ; occiput 

 to tip of nasals 39*3 ; basal length 312 ; zygomatic breadth 

 24*3 ; breadth of brain-case above meatus 20 ; front of canine 

 to back of m 3 13. 



Ordinary mainland western specimens have a greatest 

 skull-length of about 3G to 38 mm., these middle-area 

 examples, as also those from Fernando Po (subsp. poensis) 

 about 38-40, while in the Ruwenzori thomasi this measure- 

 ment is 41-42 mm., the general size of the skull varying 

 in proportion. 



With regard to Pousargues's Galago (Hemigalago) ano- 

 murus, from the Ubanghi, the colour as described and figured 

 and the short tail are so different from what is found in any 

 form of the present series, that it is evidently a wholly 

 distinct animal. If by any chance the original skulls, whose 

 measurements nearly agree with those of H. d. medius, 

 should prove not to belong to the skins described, the latter 

 would clearly have to be taken as typical, as their characters 

 are those on which the species is mainly founded. 



Specimens of this new form were obtained by Emin Pasha 

 in 1884 and the Alexander-Gosling Expedition in 1905-6. 



5. Perodicticus faustus, Thos. 



850. Medje. 



893, 957, 958, 1102, 1284, 1293, 1309, 1496. Poko. 



6. Eidolon helvum, Kerr. 

 889. Medje. 



7. Epomops franqueti franqueti, Tomes. 



860, 883. Medje, Itmi. 



33* 



