■6 



On niw Rliinoloplii/Vowj Africa. 



and dentition. Until now, however, tlie very large Rh. Hildc- 

 brandti and its small counterpart, Rh. fumigatus, have been 

 "witliout any intermediate link, widely separated in size as 

 well as in geographical distribution. Rh. H. eloqtiens greatly 

 reduces the gap between the two species; in all the 

 })oints in which Rh. H. eloquens differs from Rh. Hildebratidti 

 typicuft, it approaches Rh. fumifjatus — in size, in colour, in 

 dentition. Rh. Hiklehrandti is decidedly the most primitive 

 form : the upper p^ is distinctly perceptible, the lower p^ 

 only occasionally wanting ; in the Uganda race 7>^ is markedly 

 reduced in size, p.^ almost always completely lost ; in the 

 northern /?//. fuiiti(jatus p- is but very rarely present, p^ 

 licvcr. Uganda, the typical locality of Rh. H. eloquens, is, so 

 to speak, "on the way^' between the areas of Rh. H'Udebrandti 

 (from Mazoe to ]\Iombasa) and Rh. fumit/atus (S. Somali 

 and Abyssinia). It is not improljable that, when the region 

 between Uganda and Abyssinia is better explored, we shall 

 have to regard Rh. HUdebrandti and Rh. fumigatus no longer 

 as distinct "species," but rather as peripheral forms of one 

 species, bound together by races intermediate in characters 

 and in geographical distribution. 



The subjoined tal)le of measurements gives the difference 

 in size, from the smallest form of Rh. fumigatus to the largest 

 form of Rh. HUdebrandti. If I had been arranging the 

 forms from a phylogenetic point of view, the order would 

 have been just the reverse (the names of the races read from 

 right to leit). 



Forearm 



3rd metacarpal 



4th metacai-pal 



5th metacarpal 



Mandible, condylus to front of incisors . . 



Front of upper canine to back of m^ . . . . 



,, lower canine to back of w?, . . , . 



lih . fum i<i(itus. 



Rh. Ilildihraudti. 



exsul. 



Type. 



Ad. 



mm. 

 49-5 

 35 

 3(3-8 



38 



^f. ttjpica. 

 7 ad. spcms. 

 1 skull. 



! eloquens. • f. typica 

 3ad. spcms., 11 ad. spcms., 

 I 4 sliuUs. G skulls 



Min. 



mm. 

 51 

 36 

 37 

 39 



Max. 



mm. 



54 



38 



41 



41-8 



15-8 

 8-1 

 8-5 



{Miu. 



mm. 



577 



39-8 



42-5 



44 



17-2 



9 



9-6 



Max. 

 mm, 

 GO-5 

 42 

 44 

 45-2 

 17-5 

 9-2 

 10 



Min. 



mm. 



62 



42-3 



44-2 



45-3 



18-8 



10 



10-8 



Max. 



mm. 



67 



46 



47-8 



48 



19-8 



10-2 



11 



