FIELD BOOK OF PONDS AND STREAMS 



Incomplete metamorphosis.— Stages of the insect life — egg, 

 nymph, and adult. 



Stoneflies, mayflies, dragonflies and damselflles, water-bugs. 



Fig. 144. — Change of form in incomplete meta- 

 morphosis: I, stonefly nymph; 2, adult. 



Complete metamorphosis. — Stages of the insect life — egg, 

 larva, pupa, and adult. 



Caddis flies, moths, beetles, flies. 



Fig. 145. — Change of form in complete metamor- 

 phosis: I, mosquito larva; 2, pupa; 3, adult. 



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