536 ON A NEW POTTO FROM BRITISH EAST AFRICA. [Mar. 15, 



conclusion ; for, at least in the later phases, the animal was dead, 

 in the generally accepted sense of the word. 



A new Potto from British East Africa.* 



Mr. Oldfield Thomas, F.R.S., F.Z.S., exhibited the skin of a 

 Potto which had been obtained in British East Africa, the first 

 specimen from elsewhere than on the West Coast of Africa 

 received by the National Museum. 



The species was quite distinct from the western forms, and was 

 proposed to be called — 



Perodicticus ibeanus Thos.f 



Abstract P. Z. S. 1910, p. 17 (March 22nd). 



A long-haired Potto, blackish anteriorly, grey posteriorly. 



Size about as in the Gaboon P. batesi deWint. Fur soft and 

 thick, the wool-hair on the back nearly 20 mm. in length, and 

 the straight hairs 25-26 mm. General colour grizzled ashy, but 

 the shoulders and fore-back blackish, the contrast between the 

 two colours very marked. Head brownish clay-colour, the 

 extreme tips of the hairs blackish ; these dark tips broadening 

 posteriorly so as to make the nape and fore-quarters almost 

 black, with a, hidden suffusion of dark clay-colour. The long 

 bristle hairs of the crown and nape black. Rest of the borly, 

 behind the withers, grizzled ashy, the longer hairs dark with 

 greyish-white tips, the woolly underfur dark slaty basally, then 

 broadly clay-coloured, and with dark tips. Under-surface greyish, 

 not sharply defined, the hairs slaty basally, dull greyish white 

 terminally (grey no. 8). Arms and legs grizzled ashy like the 

 body ; hands and feet buffy brownish. Tail comparatively long, 

 cylindrical, ashy grey. 



Skull about as large as in P. batesi, but the teeth small as in 

 P, potto. Nasals very short. 



Canines rather slender. Anterior premolar long, pointed, two- 

 thirds the height of the canine. Other cheek teeth all very 

 small ; second molar smaller than the first. Anterior lower 

 premolar longer than posterior. 



Dimensions of the type, measured in flesh : — 



Head and body 339 mm. ; tail 68 ; hind-foot 76 ; ear 25. 



Skull- — upper length 64 mm. ; basal length 55 ; greatest breadth 

 46 ; nasals 14*2 x 5 - 3 ; interorbital space 9"3 ; length of cheek-tooth 

 series 16*5 ; of molars only 8 - 5 ; breadth of m 1 3 - 8, of nr 3*2. 



Hab. Kakamega Forest, near Mount Elgoii, British East 

 Africa, alt. 6000'.'" 



* Published by permission of the Trustees of the British Museum, 

 f [The complete account of the new species appears here, but the name and 

 a preliminary diagnosis were published in the 'Abstract,' No. 81, 1010. — Editok.j 



