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ANIMAL LIFE-HISTORIES 



Fi^. 904. — Life-hi^^tory of a Dragon-Fly [Libellula depressa). a, Perfect insect. B, Young Dragon-Fly emerging 

 from nymph, c, c, Young nymphs. D, Full-grown nymph about to leave the water. 



mass. They hatch out into flattened unattractive-looking nymphs, 

 which lead a predaceous aquatic existence for some time, gradually 



