FIELD BOOK OF PONDS AND STREAMS 



Fig. 149. — Nymph of Perla, an early spring stone- 

 fly. 



Chloroperla or Alloperla. — Daintily beautiful, pale greenish 

 nymphs about a quarter of an inch long, which have no gills 

 (Fig. 150). The adults which emerge through late spring 

 into midsummer are daylight fliers which like sunshine. 

 Generally distributed through North America. 



Fig. 150. — Nymph of green stonefly, Chloroperla. 



196 



