CO LOB us 125 



Measurements. No skull to specimen described. Another *skull, 

 1. 8. 9. 46. from Toro collected by Sir H. H. Johnston measures: 

 total length, 100; occipito-nasal length, 81.5; Hensel, 65.5; zygomatic 

 width, 77 ; intertemporal width, 64 ; palatal length, 36.2 ; median length 

 of nasals, 13 ; length of upper molar series, 27 ; extreme length of 

 mandible, 74; length of lower molar series, 33. 



Three examples of this remarkable monkey, one adult and two 

 young, were procured by Sir H. H. Johnston on the Ruahara River, 

 district of Toro, on the east side of Mount Ruwenzori at an altitude 

 of 4,000 feet. The species was not seen by the expedition lately 

 returned from the exploration of the mountain, so it may be con- 

 sidered rare. 



It bears a close resemblance to C. rufomitratus Peters from the 

 Tana River, but differs sufficiently in coloration to warrant its separa- 

 tion as distinct. Possibly the skulls, if they were compared, would 

 exhibit different cranial characters. The distance dividing the habitats 

 of the two forms, one a coast dweller, and the other living in the 

 interior at high elevations, and the fact that no examples have been 

 as yet procured in the intervening districts, would naturally cause us 

 to expect a different animal from the heights of Ruwenzori. No 

 account of its habits is recorded, but like many of its relatives of this 

 genus, it probably dwells in the tops of the high trees of the African 

 forest, and so is most likely to escape detection. Sir Harry Johnston 

 says of this species, that "the Red Colobus of Toro answers to its 

 Greek name in the adults, which have only four fingers on the hands 

 and the minutest trace of a thumb nail in the place where the thumb 

 is missing. But the young Colobuses of this species have a complete 

 thumb, only a little smaller than this finger would be in the Cerco- 

 pitheci. As the animal grows to maturity, so its thumb dwindles, until 

 in a very old male there may be absolutely no trace left of the missing 

 finger." 



Colobus nigrimanus Trouessart. 



Colobus nigrimanus Trouess., Bull. Mus. Hist. Nat., Paris, 1906, 



p. 444. 

 Type locality. Lirranga, banks of the Congo. Type in Paris 

 Museum. 



*In the original description of this species, by a misunderstanding, the 

 measurement of the skull of another species was given. The one recorded above 

 is correct for this species, though not belonging to the type. 



