2 ARKIV FÖR ZOOLOGI. BAND 10. N:0 12. 



It is rather difficult to decide concerning a semiadult 

 female of this group to which of the named geographical 

 races it belongs, but comparing this specimen as well with 

 specimens from the Kilimanjaro district (thus true johnstoni) 

 as with such from the Kenya district I have found it more 

 similar to the former, and I have thus used this name. 



As I have some personal knowledge about the Guenons 

 of this part of East Africa, I shall take the liberty of writ- 

 ing a few lines which I hope may serve to, partly at least, 

 throw some light on these animals which have been rather 

 carelessly treated in D. G. Elliot's »A Review of the Pri- 

 mates». In British and German East Africa two subgeneric 

 groups of Guenons are generally distributed, and both of them 

 have developed a certain number of more or less distinct 

 forms in suitable localities, but in every case there is, of 

 course, only one member of either group in each district. 

 This indicates that the different forms substitute each other 

 and are to be regarded as geographic forms. These two 

 groups are: 



l:o The cethiops-grouip according to Pocock 1907, or Chlo- 

 rocebus as defined by Elliot 1913. This is the »Tumbili» 

 of the natives, which chiefly inhabits the gallery-forests fring- 

 ing the rivers, thornbush with acacias, and partly other xe- 

 rophilous, more or less open forests, and usually lives at 

 less altitude than the members of the next group. 



2:o The albogularis-grouip of Pocock 1907, for which El- 

 liot 1913 has proposed the subgeneric name »Insignicebus» (!) 

 (a nomen mixtum et barbarum, composed of a latin and a 

 greek word). This is the »Kima» of the natives, dark Gue- 

 nons which inhabit the primeval forests up to the tree-limit 

 on the mountains, but from this region extend their distri- 

 bution all through the evergreen forest-region to its lowest 

 edge skirting the steppe country. The Kima is, however, 

 decidedly more of a forest monkey than the Tumbili. 



For Tumbilis from East Africa Elliot has used several 

 specific and subspecific names. The Tumbili from Fort Hall 

 Elliot has named Cercopithecus rubellus, låter Lasiopyga ru- 

 bella, regarding it as a distinct species. In the description 

 he says — — »no white on under parts». He calls it »a 

 reddish monkey quite different in coloring from its paler 

 relatives of the L. centralis style», to which latter johnstoni 



