Chap. XI. 



SUMMARY ON INSECTS. 



423 



anomalous cases, the females are more beautiful than 

 the males. We shall often find, in the same group of 

 birds, every gradation from no difference between the 

 sexes, to an extreme difference. In the latter case we 

 shall see that the females, like female insects, often 

 possess more or less plain traces of the characters which 

 properly belong to the males. The analogy, indeed, in 

 all these respects between birds and insects, is curiously 

 close. Whatever explanation applies to the one class 

 probably applies to the other ; and this explanation, as 

 we shall hereafter attempt to shew, is almost certainly 

 sexual selection. 



END OF VOL. I. 



&\C4 



