430 



Tnn INSECT WORLD. 



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

 Boreus hiemalis (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 FhryganidcE, or Caddis Flies, are known by their larvae, of 



Fig. 416. — Phryganea ihoiiibica 

 in repose. 



Fig. 415. — Larva of Phryganea rhonibica 

 (magnified). 



Fig. 417. — Phryganea rhonibica. 



which anglers make great use. Reaumur classed them as aquatic 

 moths. The soft and delicate body of the lan^ae is protected by a 

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

 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, Phrygafiea^ signifies yi?^^/.* The 



From (ppvyapov, a stick. 



