3^^ TRANSFORMATIONS OF INSECTS. 



The caddis flies, or rather the caddis worms, are particularly 

 interesting in their aquatic condition. They are then very car- 

 nivorous, but have soft skins ; consequently they form tubes and 



THE METAMORPHOSES OF THE CADDIS FLIES. 

 (Phrvganea Jlavkoniis, Phryganea r/wnibica, and Phryganea fusca.) 



cases out of all kinds of objects, and stick them together with 

 a little silk, like some caterpillars, the Psychidce, for instance. 

 They carry their houses, for such are their tubes, about with 



