CHAPTER V 

 O ADDIS-FLIES (Trichoptera). 



EVERY fisherman knows the Caddis- 

 worm, which is the larval form of the 

 Caddis-fly. As the number of different 

 species of Trichoptera is very large, 

 there are many different sorts of Caddis- 

 worms. Some of these make cases which 

 they fix to rocks ; most of them how- 

 ever have cases which they drag about 

 with them, and retire into it when 

 any danger approaches. These cases 

 vary much in shape and the materials of 

 which they are made. Some species are 

 however, as a rule to be found in almost 

 every water. They are extremely inter- 

 esting to watch, though, if they are acci- 

 dentally introduced into a hatching trough 

 containing trout ova, they will destroy 

 the eggs. Caddis worms are taken freely 

 by trout, and I have frequently found them, 



