THE NET-MAKING CADDIS WORM 



lined, is the inhabitant. It is an active larva about 

 three-foui'ths of an inch long, and one finds others of 

 various shorter lengths, but few longer. The old name 

 of "worm" clings to it, for in the early usage of the 

 English tongue the scientific difference between a true 

 worm and an insect larva was not regarded, and the 

 habit persists. The larva is not stout or "chunky," 

 but is rather elongated and narrow, and not uncomely 

 in appearance, at least to the nature-lover's eye. Some 

 specimens (collected in April) are tawny yellow, the 

 head and two succeeding joints being dark brown. 

 Others and younger specimens (taken July 27th) have 

 the middle and terminal joints pale green. The head 

 is flat and snakelike in appearance, the eyes small but 

 prominent. 



To the end of the body are attached two anal ap- 

 pendages, which terminate in bunches of flaring bristles. 



NET-MAKING CADDIS FLY, IMAGO, LARVA, AND HOOK 



Just beneath each appendage is a tiny hook, by which 

 the larva anchors itself to some point within its nest, 

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