93a (92a). Head rounded behind, mouthparts piercing; metanotum short and rounded, without a

longitudinal groove (Fig.A) (adults are blood-suckers; larvae are predators) ..............

...................................................................................……….........................(Diptera) Ceratopogonidae

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A

93b. Head flat behind, mouthparts without mandibles, not piercing ;metanotum long, with a

median longitudinal groove (Figs.A-B) (most are predators, one species parasitizes

mayflies)...................................................................………...............................(Diptera) Chironomidae

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A B