352 Mr. O. Thomas on 



practically absent. General colour above " drab-grey/'' the 

 other three W. African Pottos being of a more rufous brown 

 colour. Whole of bick uniform, without any darker colour 

 on the fore back. Underfur grey at base (2,rey no. 6), then 

 dull buffy whitish, the ends dark brown ; the few longer hairs 

 with light tips, not affecting the general colour. Under 

 surface well defined greyish white, the hairs grey basally, 

 whitish terminally. Outer surface of arms and legs drab- 

 grey like back, inner surface whitish like belly, but becoming 

 more drabby townrds wrists and ankles ; hands and feet drab- 

 grey above. Tail proportionally rather long, drab-grey. 



Skull rather larger than that of /'. polio ; nasals of about 

 the same length, longer than in P. ihennus. Postorbital bar 

 about as in P. batesi } broader than in potto, narrower than in 

 ibeanus. 



Teeth small throughout, very much as in P. ibeanns, 

 except that m 2 is fully equal in size to m 1 . P 2 similarly 

 two-thirds the height of the canine and longer than the teeth 

 following it, and below the same. (There is an extra pre- 

 molar on each side above in the type between the anterior 

 premolar and p 3 , but this would certainly appear to be 

 abnormal.) In P. potto p 2 is but little larger than p 3 above, 

 and is smaller than it below. The molars are also even 

 smaller. 



Dimensions of the type : — 



Head and body 355 mm. ; tail 75 ; hind foot 77 ; ear 25. 



Skull: upper length 66; basal length 58; greatest 

 breadth 47; nasals 17 ; upper cheek-tooth series 17*8 ; molars 

 only i) ; breadth of m 2 41. 



Hub. Southern Nigeria. 



Type. Adult male. B.M. no. 2. 7. 12. 1. Presented by 

 the Zoological Society, to whom it was given by Edward 

 Straw, Esq. Lived in the Zoological Gardens, May 26th to 

 Jnne 17th, 1902. 



The Pottos fall readily into two groups, large-toothed 

 and small-toothed. The former are P. edwardsi and batesi, 

 the latter P. potto, ibeanus, and the present form. From 

 P. ibeanus P. ju-ju is distinguished by its uniform colour and 

 widely different locality ; from P. potto (of which the Museum 

 contains one almost topotypical specimen) by its drab-grey 

 instead of dark brown colour and by the different proportions 

 of its premolars. The special characters of the Sierra Leone 

 P. geojfroyi, Benn., are unknown to me, but it obviously 

 cannot be the same as P. ju-ju. 



