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Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large Brown Trout that only touch streamers for the rest of the year.

True Fly Family Dixidae

Larva & pupa biology

The larvae live and feed in the surface film. This explains why the one I collected and photographed was difficult to keep below the water for clear photos... it really wanted to ride up in the film.

Specimens of the True Fly Family Dixidae

1 Larva
1 Pupa
Dixidae  True Fly Pupa

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Genus in Dixidae
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