NATURAL HISTORY. 499 



Order V. TRICHOPTtiRA.(G\\ Qpli;, hair ; nrepov, a wing.) 



Family. . Fhryganidse. (Gr. Qovyavov, a dry stick : alluding to their 

 habitations.) 



PHRYGAJiEA. 



Grar.uis (Lat. large), the Caddis-Jly.* 



at the same time all enemies are kept out. AYhen the time 

 for its change has arrived, the pupa bites through the grating, 

 rises to the surface, and crawls out of the reach of the water, 

 which would soon be fatal to it. The skin then splits down 

 the back, and the perfect insect emerges. 



The order is called Trichoptera, because the wings, instead 

 of being covered with scales as are those of butterflies, are 

 clothed with hairs. There are many species of Caddis-flies. 



THE ICHNEUMON FLY. 



WE have now reached a most important and interesting 

 order. In it are contained the bees, wasps, ants, &c. This 

 is the only order where the insects possess stings. The wings 

 are four in number, with certain veinings upon them, the shape 

 and number of which in many cases distinguishes the species. 



* In this cut the cases of the Caddis-worm are of the natural size, but the insect 

 in the centre is reduced one half. 



