INSECTS. 



sons/' or hellgrammites, larvae of a large insect, which are 

 used as bait by anglers. Here, too, belong the ant-lions, 



c 



FIG. 98. Adult male hellgrammite (Corydalis cornutus). From Riley. 



which build little pitfalls for the ants on which they feed. 

 Last to be mentioned are the caddis-flies, the aquatic larvae 

 of which protect themselves by building cases of stones, 

 sticks, etc., in which they hide and which they carry about 



