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