28 



METHODS OF INSECT LIFE. 



Flies (Diptera) — two-winged — have only two wings, 

 and a pair of poisers instead of the hinder pair. 

 These appendages are often pin-hke in shape. 



Maggots legless. (See Fig. 22.) 



00&& 



A., 



Fig. 23. — Flea, maggot, aud pupa ; magnilied. {Aplianiptera.) 



Fleas {Aphaniptera) — imperceptible- winged — have 

 no real wings, but with a good magnifying-glass they 

 will be seen to have two pairs of scales, which have 

 been considered to represent two pairs of wings. 

 The grubs are legless. 





Fk;. 21.— Mealworm Beetle, nat. size and magnified ; grub and pupa 

 \Colcoptera.) 



Beetles (Culeoptera) — sheath -winged — have two 

 pairs of wings, the upper pair horny, and thus 

 forming a kind of " sheath " for the under wmgs. 



