ROSS: HOW TO COLLECT AND PRESERVE INSECTS 



37 



wings, very finely and intricately netted with veins. The order is 

 divided into two types, the adult flies being told apart as follows : 



(a) Anisoptera or Dragonflies. — Body stout, wings broad 

 at base, not folded but held in a horizontal position outstretched 

 from body when at rest. These are strong fliers. 



(b) Zygoptera or Damselflies. — Body slender, wings nar- 

 rowed at base and folded back over the abdomen or up over the 

 back when the insect is at rest. 



Hemiptera Insects usually with two pairs of wings, and 



True Bugs with the mouthparts formed for sucking. 



The order contains two distinct suborders, 

 the Heteroptera and the Homoptera. In the Heteroptera, con- 

 taining the stink bugs, chinch bugs, and their allies, the beak is 



Fig. 30.— He- 

 miptera. A typ- 

 ical stink bug, 

 belonging to the 

 family Penta- 

 tomidae, show- 

 ing attachment 

 of beak and ar- 

 rangement of 

 wings. Actual 

 length about 0.4 

 inch. 



attached to the underside of the front part of the head, and the 

 front pair of wings has the base hardened and only the apical 

 portion membranous or delicate ; the hind pair is entirely delicate ; 

 in repose the wings are folded over and flat 

 against the body, the hind pair underneath. 

 These characters are shown in fig. 30, of a 

 stink bug belonging to the family Pentato- 

 midae. The young have the same general ap- 

 pearance and habits as the adults, but lack 

 wings. This order includes many common 



kinds such as the 

 Fig. 31. — Hemiptera. , 



Blissus leucopterus, the water bugs, water 

 chinch bug. Actual s triders (these seldom 

 length about 0.1 inch. , . 



develop wings even in 



