NATURE STUDY REVIEW [8 :o— May. lOl.i 



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Immature Insects. — 16, Stone Fly Nymph; 17, Mayfly 



Nymph ; 18, Whirligig Beetle Larva ; 19, 



Black Fly Larva. 



Black Fly Larvae (Fig. 19). 



When looking for stone fly nymphs in rocky, swift running 

 streams, the collector sometimes finds clusters of queer little crea- 

 tures, black in color, and squirming in movements, and attached to 

 the rocks or other smooth objects by the hind part of the body. The 

 free end hangs out into the current and has two brushes of hairs 

 which takes the food from the water. These larvae pass through 

 a pupa stage and then hatch out into those little black, hump 

 backed flies, Black Flies or Buffalo Gnats, which are sometimes 

 so extremely troublesome in the vicinity of their breeding places. 



Damsel Fly Nymphs (Fig. 20). 



These nymphs are usually abundant in shallow pools, 

 marshes, and in the edges of streams and ponds where water 

 plants are numerous. They crawl about among the submerged 

 plant stems and feed on the small water insects which come with- 

 in their reach. After living in this way for a time they crawl out 

 of the water on some stem and there change into the Damsel 

 Flies, insects which look like small Dragon Flies but which differ 

 in having the front and hind wings alike and when the insect is 

 at rest they are kept elevated over the back. They are not strong 

 fliers but have a slow, weak, fluttering flight. To collect and 



