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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 Jlavicornis , Phryganea rhombica , 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 
