16a (15b). Costal area of front wings (= area just behind anterior margin) nearly always with

numerous cross veins per pair of longitudinal veins (Fig.A), or if not (Fig.B) then hind wings shorter

than front wings; mouthparts not prolonged ventrally into a beak

(Figs.C-G) [lacewings, dobsonflies, antlions] ......................................Neuroptera……..194

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A B C D

E G

16b. Costal area of front wings with not more than 2-3 cross veins per pair of longitudinal veins (Fig.A);

mouthparts prolonged ventrally to form a beak-like process (Figs.B-D)

[scorpionflies]...................................................................................................................….....Mecoptera

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A B C D