﻿4 ARKIV FÖR ZOOLOGI. BAND 4. N.O 15. 



this monkey was quite rare and that it was very sby and 

 difficult to obtain. 



The accompanying sketch made by Mr. Sandberg ex- 

 plains very plainly the exact locahty (fig. 2*) where the type- 

 specimen was obtained. As may be seen it is situated only 

 a little to the north of 13° S. lat., and this is thus the most 

 southern locahty in which a Colohus bas been found. Mr. 

 Sandberg's Guereza belongs evidently to the angolensis 

 - palliatus - group with a short white måne at the shoul- 

 ders. With regard to the absence of a white frontal band 

 and the presence of a whirl on top of the head it closely 

 resembles C. angolensis about which Pousargue writes »les 

 poils noirs du dessus de la tete partent en rayonnant d'un 

 tourbillon placé au milieu du vertex entré les oreilles» {2) 

 (p. 147). From the typical C. angolensis, however, this Gue- 

 reza differs in having the tail considerably longer than head 

 and body while the contrary is the case with C. angolensis 

 ,according to Pousargue (2). In Sandberg's Guereza the 

 white portion of the tail is mucli longer than in C. angolensis 



about which the original describer P. L. Sclater writes 



»black tail having only a white termination» (1). Lydekker 

 has recently described a Guereza that probably belongs to 

 this same group because it is said to be without »a white 

 superciliary ridge» {3). The author quoted names his new 

 Guereza from »Qugo, Central Equatorial Africa». »Colohus 

 ■palliatus Cottoni», but I should think C. angolensis Cottoni 

 would be more correct as C. palliatus and allied forms have 

 a white superciliary band. Powell Cotton's Guereza is, 

 however, easily distinguished from Sandbergs Guereza, be- 

 cause the former has no white perineal patch, and the ter- 

 minal half of its tail is said to be »grey with a white tip» 

 (3) instead of entirely white. The shoulder tufts of Cotton's 

 Guereza are said to be »narrow» (15) but exact comparative 

 measurements are not recorded. It is therefore difficult to 

 say if the shoulder tufts are smaller or larger in one or 

 the other of these subspecies, but they seem in both to be 

 smaller than in Colohus palliatus according to Peters' figure 

 (1879 [4) ). From C. palliatus and its subspecies Sandbebg's 

 Guereza like the typical C. angolensis differs not only through 

 the absence of the white frontal band but also by the whirl 

 on the vertQx described above, while in C. palliatus, as Pou- 



