272 



ANIMAL COLOKATION. 



all degenerate in this insect ; and it is the eyes rather than the 

 olfactory organs which are important for the female, on the 

 theorj' of sexual selection. Besides, we commonly meet w;ith 

 simple, non-pectinated antennae among females of Bombyces, 

 which are not wingless, and in which there is a more or less 

 marked sexual dimorphism ; for instance, in the following : 



Fig. 36. — Gypsy Moth (male, female, cocoon, and larva). 



the Grypsy moth (fig. 33), the December moth, the Lackey, 

 the Fox moth. Oak Eggar, etc. 



The Courtship of Spiders. 



The " courtship " of spiders has been used as an argument in 

 favour of the development of special colours and markings in 

 the male, through selection by the female. 



It appears to be an undoubted fact that the males of certain 

 spiders indulge in the most singular antics previously to 



