16 



GUIDE TO INSECTS. 



Table- Like most other parasites it is difficult to determine where it should 

 case 31. ^ e placed in a natural system, and it is therefore placed here between 



Fie. 12. 



Fig. 13. 



Coxa 



-Coxa. 



Under side of an earwig. (1077.) Under side of a cockroach. (1080. 

 The coxa^ are shaded black. 



the Thysanura and Orthoptera. 

 to the Gryllidcv (crickets). 



It was originally described as allied 



Family Foeficulid^. 



Following this are the earwigs, Forficulidm (1060-1069). Of 

 this family there are many hundreds of species, and they are found 

 all over the world ; two are common in Britain, Forficula auricularia 

 (1067) and Labia minor (1065), the smaller of these, however, 

 is not often seen as it is chiefly found in manure heaps. One of 

 the chief characteristics of this family is the pair of forceps at the 

 end of the body. The shape of these varies very much, and they 

 are smaller in the female than in the male. They are modifications 

 of the cerci. In the common British and many other species the 

 insect leaves the egg with the forceps already to some extent formed, 



