430 



THE INSECT WORLD. 



(Fig. 413), resembling a large gnat, furnished with four wings, and 

 Boreus hy emails (Fig. 414), of a brilliant black, met with in Sweden 

 and in the elevated parts of the Alps, jumping about on the snow in 

 considerable troops — are representatives. The latter has been found 

 in England. 



The Fhryganld(E, or Caddis Flies, are known by their larvae, of 



Fig. 416. — Phryganea rhombica, 

 'n\ repose. 



Fig. 415. — Larva of Phryganea rhombica. 



Fig. 417. — Phryganea rhombica. 



which anglers make great use. Reaumur classed them as aquatic 

 moths. The soft and delicate body of the larvae is protected by a 

 case, to which they cling by two hooks, placed at the extremity of 

 their abdomen. They are called by different names in allusion to 

 their habits ; as, for instance, case worms, from their living in a case 

 covered with little bits of wood or sand, which they draw after them 

 as they go. Their scientific name, Phryganea, signifies /^^^/.^ The 



From (ppvyafioi; a stick 



