202 Insect Architecture, 



CHAPTER X. 



CADDIS-WORMS AND CARPENTER-CATERPILLARS. 



nPHEBE 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 larvce of the four-winged flies in the order 

 TricTioptera of Kirby and Spence, we may mention sand, 

 stones, shells, wood, and leaves," which are skilfully joined 

 and strongly cemented. . One of these grubs forms a pretty 

 case of leaves glued together longitudinally, but leaving an 

 aperture sufficiently large for the inhabitant to put out its 

 head and shoulders when it wishes to look about for food. 



Leaf Nest of Caddis-Worm. 



Another employs pieces of reed cut into convenient lengths, 

 or of grass, straw, wood, &c., carefully joining and cementing 

 each piece to its fellow as the work proceeds; and he 

 frequently finishes the whole by adding a broad piece longer 



Reed Nest of Cadd s-Worm. 



than the rest to shade his door-way overhead, so that he 

 may not be seen from above. A more laborious structure is 

 reared by the grub of a beautiful caddis-fly (Phryganea), 



