12a (11b). Front wings relatively large and usually triangular; hind wings small and usually

rounded, the wings at rest held together above the body; wings usually with many veins

and cells; antennae short, bristle-like, and inconspicuous; abdomen with 2-3 thread-like

caudal filaments (Fig.A); delicate, soft-bodied insects (Fig.B) [mayflies]............Ephemeroptera

 

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A B

 

 

 

12b. Not as previously described........................................................................................................... 13