SEXUAL SELECTION 



Lastly, in the baboon family, the adult male pf Cyno- 

 eephakis hamadryas diilers from the female not only by 

 his immense mane, but slightly in the color of the hair and 

 of the naked callosities. In the drill (C. hucophaua) the 

 females and young are much paler colored, with less green, 

 than the adult males. No other member in the whole class 

 of mammals is colored in so extraordinary a manner as the 

 adult male mandrill (C. mormon). The face at this age be- 

 comes of a fine blue, with the ridge and tip of the nose of 

 the most brilliant red. According to some authors, the face 

 is also marked with whitish stripes, and is shaded in parts 

 with black, but the colors appear to be variable. On the 

 forehead there is a crest of hair, and on the chin a yellow 

 beard. "Toutes les parties supdrieures de leurs cuisses et 

 le grand espace nu de leurs fesses sont dgalement color^s du 

 rouge le plus Tif, avec un m^ange de bleu qui ne manque 

 r^ellement pas d'^l^gance." " When the animal is excited 

 all the naked parts become much more vividly tinted. Sev- 

 eral authors have used the strongest expressions in describ- 

 ing these resplendent colors, which they compare with those 

 of the most brilliant birds. Another remarkable peculiarity 

 is that when the great canine teeth are fully developed, im- 

 mense protuberances of bone are formed on each cheek, 

 which are deeply furrowed longitudinally, and the naked 

 skin over them is brilliantly colored, as just described 

 (Pig. 69). In the adult females and in the young of both 

 sexes these protuberances are scarcely perceptible; and the 

 naked parts are much less bright colored, the face being 

 almost black, tinged with blue. In the adult female, how- 

 ever, the nose at certain regular intervals of time becomes 

 tinted with red. 



In all the cases hitherto given the male is more strongly 

 or brighter colored than the female, and differs from the 



8> Gervais, "Hist. Nat dea Mammittres," 1854, p. 103. Figures are given 

 of the skull of the male. Also Desmarest, "Mammalogie, " p. 10. GeofEroy 

 8t -Hilaire and F. Cuvier, "Hist. Nat. des Mamm.," 1824, torn. i. 



