ROSS : HOW TO COLLECT AND PRESERVE INSECTS 



47 



daily conspicuous on oak trees. A parasitic wasp, Cheir opacity s 

 colon (Linnaeus), is shown in fig. 49. The parasitic wasps are 

 extremely diverse in size, shape, and habits. They range in size 

 between 0.02 and 2.0 inches. 



Trichoptera Insects with two pairs of wings, poorly de- 



Caddisflies veloped mouthparts of the chewing type, and 



long antennae ; without tails on the posterior 

 end of the body. In repose, the wings are held rooflike over the 

 body and have only a moderate number of longitudinal veins, 

 which are not connected by crossveins into any resemblance of 

 a network. Neither body nor wings are covered with scales. The 



Fig. 50. — Trichoptera. Rhyacophila 

 fenestra; the adult form of this cad- 

 disfly is shown here. Actual length 

 about 0.4 inch. 



Fig. 51. — Trichoptera. Rhyacophila 

 fenestra; the larva, shown here, is 

 aquatic and builds no case. The lar- 

 vae of some other kinds of caddis- 

 flies live in cases made of sticks and 

 stones. 



