The Descent of Man

lour, in the latter it is paler. In the beautiful and
curious moustache monkey (Cercopithecus
cephus) the only difference between the sexes is
that the tail of the male is chestnut and that of
the female grey; but Mr. Bartlett informs me
that all the hues become more pronounced in
the male when adult, whilst in the female they
remain as they were during youth. According
to the coloured figures given by Solomon Muller,
the male of Semnopithecus chrysomelas is
nearly black, the female being pale brown. In
the Cercopithecus cynosurus and griseo-viridis
one part of the body, which is confined to the
male sex, is of the most brilliant blue or green,
and contrasts strikingly with the naked skin on
the hinder part of the body, which is vivid red.
[Fig. 69. Head of male Mandrill (from Gervais,
'Hist. Nat. des
Mammiferes').]
Lastly, in the baboon family, the adult male of
Cynocephalus hamadryas differs from the fe-