7a (6a).    Antennae long and conspicuous; abdomen terminates in one long style (rarely 2); wings

                       with a single forked vein (Fig.A); halteres (= knobbed modified hind wings) present

                       and  usually terminating in a hooklike bristle; minute insects, usually <5 mm in length

                       [male scale insects] ................................................................................................…......Homoptera

 

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          A

 

7b.    Antennae short, bristle-like, and inconspicuous; abdomen with 2-3 thread-like caudal

filaments; wings with numerous veins and cells; halteres absent; usually >5 mm in length

 (Fig. A) [mayflies]......................................................................................................Ephemeroptera

 

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A