140 



ON NATTRE 



through in its advance to the modern winged 

 condition. In other words, the metamorpho-i- 

 of the individual sums up for us in brief the 

 evolution of the kind. 



Observe, however, that the young earwigs do 

 not pass through any distinct and well-marked 



stages of la; 

 pupa, and imago 

 grub, chrys- 

 alis, and butter- 

 fly like their 

 more advanced 

 relations. It is 

 true, the name^ 

 of larva and 

 pupa are fre- 

 ijuently given to 

 the two earlier 

 phases in the 

 life of the ear- 

 wig and its 

 allies Hut the 

 terms are un- 

 applied. All 

 that happens 

 to the earwig 



is a gradual series of successive moults ; and 

 during one of these moults the wings make their 

 appearance. Moreover, the young earwig when 

 just hatched out of the egg (as you can see 

 in No. 1 8) resembles its mother in everything 

 essential save in the possession of wings. There 



NO. 15. REPLACING THE WINGS BENEATH 

 THE WING-CASES. 



