SEXUAL COLORATION. 



271 



genus Psyche, the dull colours of the male insect are still more 

 marked ; the Vapourer is a rich brown, with a white spot in 

 the centre of each fore-wing, l>ut the colour of Psyche is a dull 

 greyish brown ; in Psyche (fig. 28), the female is still more 



Fig. 34. Male and Female of Winter Moth. 



degenerate. Figs. 34, 35, represent the males and the wing- 

 less females of two Geometers ; it can hardly be said that 

 these two moths are conspicuously inferior in their coloration 

 to some of their immediate allies which have a winged female. 



m 



vV 



. 



: 

 * 



Fig. 35. Male and Wingless Female of Winter Moth. 



The antennas of the female Vapourer moth are thread-like, and 

 not "pectinated," as in the male; they are doubtless, therefore, 

 as Mr. Poulton remarks, less efficient as sense organs ; but 

 it must be noted that we have no evidence that the eyes are at 



