222 MINUTE MARVELS OF NATURE 



of moths. Fig. 147 illustrates a caddis-fly, which 

 has been slightly magnified in order to show its 

 structure. 



Caddis-worms divested of their cases are familiar 



Fig. 147. A caddis-fly, x 3 diameters 



to every disciple of the "gentle art." In Fig. 148 

 one of these is shown slightly magnified. The 

 head and legs are protected by being hard and 

 horny, but the hinder part of the body is white 

 and soft, and it is to protect these parts that the 

 larva so assiduously builds its portable tunnel. 



The larvae of these insects are extremely 

 interesting on account of this curious habit of 



