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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.

Updates from April 4, 2007

Closeup insects by Bnewell from the Big Thompson River in Montana

Rhithrogena virilis  Mayfly Spinner
Before I reared this specimen the nymphs were unknown. See Western North American Naturalist for the paper on the description of this species' nymph.
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