COLOBUS 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. 
