PLATE VI. 



FIG. i. Ephemera vulgata (May-fly), 

 twice natural size, ready to assume its 

 sub-imago or semi-final flying existence. 

 Note the wing as seen under the pupal 

 mask. 



FIG. 2. flying state of Ephemera 





FIG. 4 Ephemeridas CloSon rujulum, 

 Flying State. Magnified. 



FIG. 3. Ephemera, CloSon rufulum, twice natural 

 size, ready to assume its sub-imago existence. 

 Note the wings. 



THE EPHEMERID^E 



