INSECTS BENEFICIAL AND BEAUTIFUL 



259 



funnel tapering down to the opening of tlie case. Howard 

 speaks of finding 166 of these nets on a rock about 

 eighteen inches in diameter. 



The larvae of dragon flies, damsel, and caddis flies may 

 best be collected in May or June by raking out the 



Fig. 109. Male Cecropia and Cocoon. Lowland Form 

 (^ natural size. From photograph by the author) 



leaves and bunches of grass from the bottom of pools and 

 streams. They may then be kept in the school aquaria, and 

 the feeding and final transformations be easily observed. 

 An excursion to some pond in June, when the dragon and 



