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 vulgata. 



FIG. 4. Ephemeridae CloCon rujulum 

 Flying State. Magnified. 



FIG. 3 Ephemera, Clofon rufulutn, twice natural 

 size, ready to assume its sub-imago existence. 

 Note the wings. 



THE EPHEMERID^: 



