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SEXUAL selection: mammals. 



Part 1 1. 



leucojohmus) the females and young are much paler- 

 coloured, with less green, than the adult males. No 

 other member of the whole class of mammals is coloured 

 in so extraordinary a manner as the adult male mandrill 

 {Gynoceplialus mormon). The face at this age becomes 

 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 



Fig. 6T. Head of male Mandrill (from Gervais, 'Hist. Nat. des Mammiferes ')• 



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

 the forehead tliere is a crest of hair, and on the chin a 



