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PHYLUM ARTHROPODA — CLASS INSECTA 



319 



Fig. i84.-Mayflies and dragonflies. 1. Nymph of Rubicund f^^gonfly Sympe^ 

 trum ntbicundultim; 2. nymph of Lestes uncatus; 3,. nymph of the prickleback 

 Ephemerella grandis. dorsal view. A side view showing spines on back. ^. ^P n^f 

 on abdomen of smaller "prickleback" ; 4, the "trailer n'a>fl>. ^P^t^Jil'I'ern bunch? 

 tn liberate her efcgs (drawing by C. H. Kennedy) ; 5, nymph ot wesiern "uncii 

 gni'^%L™fcciden^aZis/6f nymph of '■little ^^'^]^:Cvrr^''VZ'%hvistensen 

 7 adult Of the "big curler." Pteronarcrjs sp. (From Needham and Chnstensen, 

 permission Utah Agricultural Experiment Station.) 



