The Descent of Man

Brachyurus the scarlet tint is brighter than that
of the most blushing Caucasian damsel. It is
sometimes more distinctly orange than in any
Mongolian, and in several species it is blue,
passing into violet or grey. In all the species
known to Mr. Bartlett, in which the adults of
both sexes have strongly-coloured faces, the
colours are dull or absent during early youth.
This likewise holds good with the mandrill and
Rhesus, in which the face and the posterior
parts of the body are brilliantly coloured in one
sex alone. In these latter cases we have reason
to believe that the colours were acquired
through sexual selection; and we are naturally
led to extend the same view to the foregoing
species, though both sexes when adult have
their faces coloured in the same manner.
[Fig. 78. Cercopithecus diana (from Brehm).]
Although many kinds of monkeys are far from
beautiful according to our taste, other species
are universally admired for their elegant ap-