PERODICTICUS 39 



length of time. Of the four forms recognized, three are found on the 

 western part of the African Continent, one on the eastern. P. potto, 

 the most northerly of the known species, is found on the Gold coast 

 to Sierra Leone, but its dispersion is not accurately known. P. ju-ju 

 is a native of Southern Nigeria, and P. edwardsi goes from Cameroon 

 into French Congo; and at Irneti, Central Congo, P. faustus was 

 found. On the east side of Africa in the Kakamega forest within 

 British Territory P. ibeanus was procured. 



KEY TO THE SPECIES. 



A. Tail very short, length about one inch ; muzzle short, blunt. 



a. Teeth small. 



a.' Head and neck grayish brown P. potto. 



b! Head and neck drab gray, no black on back. . .P. ju-ju. 

 c! Head and neck grizzled hoary gray, shoulders 



and forehead blackish P. ibeanus. 



d! Head and neck drab, hairs tipped with 



hoary P. faustus. 



b. Teeth large P. edwardsi. 



Perodicticus potto (E. Geoffroy). 



Potto Bosman, Beschrijv. Guin. Gondk., II, 1704, p. 32, fig. 4. 

 Nycticebus potto E. Geoff., Ann. Mus. Hist. Nat. Paris, XIX, 



1812, p. 165 ; Fitzing., Sitzungsb. Meth. Naturw. Akad. Wiss. 



Wien, 1870, p. 719 ; Schleg., Mus. Pays-Bas, Simiae, 1876, p. 



287. 

 Perodicticus geoffroyi Bennett, Proc. Zool. Soc. Lond., 1831, p. 



109; Major, Proc. Zool. Soc. Lond., 1901, p. 130; Bedd., 



Proc. Zool. Soc. Lond., 1904, p. 160, fig. II, (Brain). 

 Potto bosmani Less., Spec. Mamm., 1840, p. 238. 

 Perodicticus potto Schinz, Syn. Mamm., I, 1844, p. 110; Wagn., 



Schreb., Saugth. Suppl., V, 1855, p. 15; Dahlb., Stud. Zool. 



Fam. Reg. Anim. Natur., fasc. I, 1856, p. 208, tab. VIII; 



Gray, Proc. Zool. Soc. Lond., 1863, p. 150; Huxley, Proc. 



Zool. Soc. Lond., 1864, p. 335 ; Pousarg., Ann. Scien. Nat. 



Paris, III, 7me Ser., 1891, p. 245; Forbes, Handb. Primates, 



I, 1894, p. 28; Bedd., Proc. Zool. Soc. Lond., 1895, p. 145, 



fig. 2; 1904, p. 160, (Brain) ; Major, Proc. Zool. Soc. Lond., 



1901, p. 136, fig. 33. 

 Stenops potto Pel, Bijdr. Dierk., 1852, p. 41. 



