38 BINAR LONNBERG, MAMMALS COLLECTED IN CENTRAL AFRICA. 



above the shoulders are provided with whitish rings 2 — 3 mm. in breadth, but with broader 

 dark interspaces. These rings are too few to produce a real grizzled appearance. 



The length of the hairs of the brow-fringe is 5 — 6,5 cm. The length of the hairs of 

 the parieto-occipital crest is 5 — 7 cm., the longest hair being found on the occiput. The 

 tufts behind the ears, and the long soft hairs on the neck attain a length of about 10 cm. 

 The black hair of the upper back is generally 8 cm., but individual hairs reach a length 

 of 13 cm., or even more. 



The colour of the females is similar, but the »warm sepia » is somewhat paler on the 

 long soft hairs at the ears, hind neck etc. The white rings on the hairs at the shoulders 

 are still fewer than in the male and are entirely absent in one of the females from the 

 Beni forest. In two of the females the colour of the lower side tends to assume a »reddish 

 black)) (Dauthenay: 344, 2) colour, or a dark shade of »warm sepia », and in some of them 

 there is a slight tint of this colour on the tighs as well. 



The three immature specimens are similar to the females. They have no light rings 

 on the hairs at the shoulders. 



The hairs of the females are partly less long than the corresponding ones of the male. 

 The brow-fringe is about 5 — 6 cm. The tufts at the ears, and the long soft mane on the 

 hind neck are less developed. 



The colour of these specimens agrees with that of Matschie's Gercocebus albigena 

 ituricus, which appears to be the darkest of the known races of the albigena-gromp with 

 the exception of Lydekker's johnstoni which originally was said to be entirely black, 

 or, as Elliot adds^ about the type (a young animal), »shoulders and under parts tinged 

 with red». Afterwards it has been believed that the fuUgrown C. a. johnstoni should 

 have mane and a short mantle of a brownish tint, which Elliot terms »Prout's brown 

 with a purplish tinge ». Such a colour description does not in any case suit the present 

 specimens. Besides Matschie^ has proved that his ituricus in no stage is entirely black, 

 and this is confirmed by the conformity in colouration of the present specimens. The 

 author just quoted has also pointed out that when reviewing the races of Gercocebus 

 belonging to this group Schwarz has confused at least two different forms under the 

 name of johnstoni viz. the Uganda Mangabey, which has a chocolate coloured mane 

 and is smaller in size, and the Ituri form which is larger. Matschie has named the former 

 G. a. ugandce, the latter G. a. ituricus. 



With regard to the characteristics of the skull (cf. PI. XII, fig. 1& 2) there appears 

 to be some confusion yet. When describing the skull of »C. a. johnstoni » Schwarz writes" 

 as follows: »Der untere Rand des Jochbogens liegt meist etwa in gleicher Hohe mit dem 

 Alveolarrande ». Elliot in his »Monograph» has gone so far as to declare* as a charac- 

 teristic of the whole subgenus »zygomatic arch (jugal), below alveolar border of molars ». 

 He does not appear to have observed that this statement stands in opposition to a quota- 

 tion from Schwarz concerning Gercocebus albigena zenkeri which he renders a couple of 



' Review of Primates II, p. 268. 



2 Rev. Zool. Afrio. 1913, p. 208—210. 



" Silz.ber. Ges. Naturforsch. Preunde, Berlin 1910. 



« I. c. II p. 266. 



