— 140 — 



careful original description of its exterior nothing needs to be 

 added. The foUowing measurements of its skull may, however, be 

 recorded for future comparison. 



Greatest length of skull 92.5 mm. 



Condylobasal length 65 » 



Basai length 59 » 



Zygomatic breadth 62.5 » 



Breadth of braincase 55 » 



Least interorbita! width 5 » 



Breadth across outside of w' . . . 26.6 » 



Length of upper molar séries . . . 21.2 » 



» of lower molar séries ... 23.8 » 



About the geographical distribution of this species nothing is 

 known with certainty. It is onlv labeled <.< Haut Congo ». 



Cercopithecus pygerythrus centralis (Nkumann, Pocock). 



Béni (Borgerhoff), n" 1026; Makala (Christy), n" 1569; Mole- 

 kera (Pii.ette), n" 1792; Kaniki (Pii.ette), n"- 1796, 1797; Béni 

 (Pilette), n' 1809; Kasindi (Pilette), n° iSic^; Béni (Bonnevie), 

 n"' 3308, 3309, 3310; Ponthiersnlle (Pii.ette), n" 233S. 



There prevails a considérable confusion considering this groiip, 

 which bas not been lessened by the fact that immature spécimens 

 and even unclean spécimens bave been named as new species. It 

 appears, however probable, that the « Tumbili » monkevs of the 

 open country in eastern Congo are identical with those of Ankole 

 which latter according to Pocock (') bave been stated by Neumann 

 himself to be bis centralis. Spécimens from f. i. Béni, Makala and 

 Ponthierville are alike. Thev bave ail plenty of more or less 

 fawn coloured hairs below the tail and at the callosities. The white 

 frontal band is always présent, although there is a tringe of black 



(') Proc. '/.flol. Soc. London, 1907, p. 739. 



