The Descent of Man

nus; the young of the former, and I believe of
the latter species, resembling the females. With
Pithecia leucocephala the young likewise resemble
the females, which are brownish-black
above and light rusty-red beneath, the adult
males being black. The ruff of hair round the
face of Ateles marginatus is tinted yellow in the
male and white in the female. Turning to the
Old World, the males of Hylobates hoolock are
always black, with the exception of a white
band over the brows; the females vary from
whity-brown to a dark tint mixed with black,
but are never wholly black. (30. On Mycetes,
Rengger, ibid. s. 14; and Brehm, 'Thierleben,' B.
i. s. 96, 107. On Ateles Desmarest, 'Mammalogie,'
p. 75. On Hylobates, Blyth, 'Land and Water,'
1867, p. 135. On the Semnopithecus, S. Muller,
'Zoog. Indischen Archipel.' tab. x.) In the
beautiful Cercopithecus diana, the head of the
adult male is of an intense black, whilst that of
the female is dark grey; in the former the fur
between the thighs is of an elegant fawn- co-