— 139 — 



Fundi) and the most sonthern locality, Baraka at Tanqanvika are 

 similar, but the speckling on the head and anterior partît may at the 

 same localitv be a little more vellowish or whitish. A small voungf 

 is also similar to the adult. 



The southward extension of this species to western Tanganyika 

 (Baraka) does not appear to hâve been known before. 



Cercopithecus Denti Liebrechtsi Dubois and Matschie has been 

 based on a spécimen from Stanleyfalls (n" 24) which has white on 

 the forehead so that it forms a brow-band. Otherwise it does not 

 perceptiblv difter from other spécimens of Denti from other loca- 

 lities. Now the developement of white on the forehead is subjected 

 to individual variation. One spécimen in the Congo Muséum 

 (n° 2107) from Mawambi (which is the tvpe localitv for the 

 species!) has quite as much white on the forehead as the type of 

 Liebrechtsi. One spécimen from Fundi has also nearly as much, 

 vvhile another has no white at ail. One of the spécimens from 

 Baraka has more white on the forehead than the other. Under 

 such circumstances I must regard C. D. Liebrechtsi only as an 

 individual aberration of C. Denti. 



jj..- Cercopithecus elegans Dubois and Matschie. 

 Types : Aruwimi (Weyns), n"" 308, 346. 



This Guenon is nearly related to C. Denti, but easy to recognize 

 on the white cheeks, and on the black dominating more completely 

 in the temporal région, but especially on its grey hind legs. As it 

 has been found in Aruwimi, it is évident that it substitutes C. Denti 

 on the western side of the great Lualaba river. 



(t^ 



Cercopithecus petronellae Buttikofer. 



A cotvpe of this interesting Guenon is now in the possession 

 of the Congo Muséum (n° 3428) where it has been received from 

 the Zoological Garden of Antwerp the 15* July 19 14. To the 



