138 



Fi. \sni. ir.HTs ON 



Some insects have wings, and some have none; 

 but among in^ecN with none, we may distinguish 

 two classes: those whose progenitors could fly, 

 hut who have themselves degenerated so as to 

 become windless ; and those who never had wings 

 .it all, but represent the primitive non-flying an- 

 cestor. Several 

 of these carls 

 wingless type>. 

 still persist to 

 the present day ; 

 and they very 

 closely resemble 

 the young of 

 the earwig. 

 They have a 

 head with a 

 couple of wav- 

 ing antenna- ; 

 they have a body 

 of three 

 ments, each 

 which bears a 



pair of legs, but no wings ; they have a long, 

 jointed abdomen ; and at its end they have two 

 appendages, which, though not specialised into 

 pincers, distinctly suggest the forceps of the earwig. 

 Indeed, if the baby earwigs always remained in 

 their first larval stage, we might easily mistake 

 them for some of these primitive wingless c; 

 tures. No. 19 is a rough sketch of such an early 

 type of non-flying insect, by name Campodea. 



NO. IJ. THE USE OF THE H.NCEKS. 



