34 
HAMLYN'S MENAGERIE MAGAZINE. 
HAMLYN'S MANGABEY. 
From the Annals and Magazine of Natural 
History, Ser. 7, Vol. xviii., September, 1906. 
Description of a new species of Mang-abey (Cero- 
cebus Hamlyni) by R. I. Pocock, F.L.S., F.Z.S., 
Superintendent of the Zoological Society s 
Gardens. 
CERCOCEBUS HAMLYNI, sp. n. 
Face pale flesh-coloured, with darker and 
lighter, larger and smaller spots of brown pig- 
ment, most plentiful round and below the eyes 
and on the bare part of the cheek, but absent on 
the upper and lower lips and on the nose. Upper 
lids whiter than surrounding skin, with white 
eyelashes. Iris of eye olive-brown; ball of the 
eye, where visible, white, with brown pigment-, 
spots. Brow-ridge white, with a few pigment- 
spots. Ears flesh-coloured, with a few pigment- 
spots. Summit of head thickly hairy, the hairs 
longest along the middle and forming posteriorly 
a parietooccipital crest, for the most part black- 
ish to the roots, with greyish tips. In front and 
at the sides this black crown is sharply defined 
by the greyish-white hair forming- a narrow brown 
band and by the hair of the same colour clothing 
the cheeks and the area behind the ear. The hairs 
on the cheek forming a long backwardly directed 
tuft concealing and projecting- beyond the lower 
half of the ear. A simliar white tuftl formed by 
the hairs behind the ear. Extending backwards 
■from the head over the nape of the neck and be- 
tween the shoulders there is a broad pale brown 
band, which becomes broader and at the same 
time fainter, less well defined, and more diffused 
over the thoracic area of the back, and finally 
dies away on the lumbar region, leaving the sacral 
region and the sides of the body greyish white. 
Throat, fore part of chest, and belly whitish; a 
large ashy grey patch on the area of the chest 
behind the mammae. Tail entirely greyish white. 
Outside of upper arm greyish white tinted with 
brown, of forearm blackish iron-grey between the 
elbow and wrist; inner side of forearm infuscate. 
Hands yellowish grey above, the palms and nails 
pinky flesh-coloured. Outer and inner side of 
legs and upper side of feet greyish white. Soles 
of feet and mails pinky flesh-coloured. Coat thick, 
almost woolly, the long hairs glistening. 
Head and body about 16 English inches 
( = 400mm.); tail about 20 inches ( = 500mm.). 
Locality.— Upper Congo, exact area un- 
known. 
The above-given diagnosis is taken from a 
living female specimen, still with milk-dentition, 
brought to London with an example of Wolf's 
guenon (Cercopithecus WoLfi) and of Brazza's 
guenon (C. neglectus). I 'am indebted to Mr. J. 
D. Hamlyn, the well-known importer of wild ani- 
mals, for the opportunity to describe it, and I have 
great pleasure in associating the new species of 
which it is the type with his name. 
With its pointed head-crest and long whis- 
kers this species falls into the category typified by 
Cercocebus albigena, Gray, subsp. Rothschildi, 
Lydd., and C. congicus, Sclater. From the for- 
mer it may be distinguished by its yellowish or 
greyish-white coloration. To the latter it has 
many points of resemblance, notably the pink 
fleshy hue of the face, hands and feet, the white 
throat, cheeks, and tail. But whereas in C. con- 
gicus the arms, the legs down to the knees, and 
the entire body with exoeptios of the chest are 
black, in C. Hamlyni the hind-quarters are entire- 
ly whitish grey, the arms are merely ashy grey 
(especially between the elbow and wrrist), and the 
entire body is whitish grey except for the ashy 
tint of the back and chest. 
It is regrettable that only one specimen of 
each of these two species, namely C. congicus and 
C. Hamlyni, has been seen, and also that no ex- 
act locality is known for either. That the differ- 
ence between the two specimens is not sexual is 
proved by the feminine gender of both; that it is 
not assignable to age is rendered probable by the 
approximate similarity in coloration between 
young and adult examples of other species of Cer- 
cocebus, namely of C. fuliginosus, lunulatus, 
aethiopicus, chrysogaster, Hagenbecki, and albi- 
gena. 
It must be freely conceded that the pinkiness 
of the face, of the soles of the feet, palms of the 
hands, and especially, perhaps, of th enails, sug- 
gests partial albinistic variation both in congicus 
and Hamlyni. If this were so, the two might be 
dismissed as piebald sports of the form of C. 
albigena described as Rothschildi, which these re- 
semble in length of whisker, absence of frontal 
fringe, and, at least in the case of Hamlyni, in tlie 
shape of the crest on the crown of the head. I do 
no, however, think that such a conclusion is war- 
ranted by the evidence; for, in the firrst place, the 
normal colour of the eyes and the bilateral sym- 
metry of the patter formed by the white patches in 
congicus and the black patches in Hamlyni are 
not suggestive of albinism. Moreover, the ab- 
sence of black pigment under the skin of the face, 
hands, and feet in some races of man and of chim- 
panzee and in some species of macaques is op- 
posed to the view that this defect is necessarily 
or even probably indicative of albinos in the higher 
Primates. Finally, although black is the preva- 
lent colour of the face in the genus Cercocebus, 
the face of C. fuliginisus is often to a great ex- 
tent flesh-coloured. As for the yellowish-grey 
hue of £he hairs in C. Hamlyni, this colour occurs 
too commonly in quadrumanous Primates, eg'., 
