Chapter X. 



CADDIS-WORMS AND CARPENTER-CATERPILLARS. 



There is a very interesting class of grubs which 

 live under water, where they construct for themselves 

 moveable tents of various materials as their habits 

 direct them, or as the substances they require can be 

 conveniently procured. Among the materials used 

 by these singular grubs, well known to fishermen by 

 the name of caddis-worms, and to naturalists as the 

 larva of the four-winged flies in the order Trichop- 

 tera, we may mention sand, stones, shells, wood, and 

 leavcs.which are skilfully joined and strongly cemented. 

 One of these grubs forms a pretty case of leaves 

 glued together longitudinally, but leaving an aper- 

 ture sufficiently large for the inhabitant to put out its 

 head and shoulders when it wishes to look about for 



Leaf Nest of CaddisWurm. 



food. Another employs pieces of reed cut into con- 

 venient lengths, or of grass, straw, wood, &c, care- 

 fully joining and cementing each piece to its fellow 

 is the work proceeds; and he frequently finishes the 



Retd JVeif of Caddis-Worm. 



