366 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. 
(Phryganea flavicornis, Phryganea rhombica, and Phryganea fusca.) 
cases out of all kinds of objects, and stick them together with 
a little silk, like some caterpillars, the Psychide, for instance. 
They carry their houses, for such are their tubes, about with 
