





FIG. 123. May-flies (Ephemera vctna Etn.) 



/, 2, side and back views of nymph ; j, 4, side and back view of adult male (Siphlimts 

 alternatits Say); j, 6, side and back view of nymph; 7, side view of adult male. (After 



Needham) 



96 



