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