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.

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Mayfly Species Paraleptophlebia praepedita (Mahogany Dun)

This species may reinforce hatches of Paraleptophlebia debilis.

Where & when

Time of year : July through October

Preferred waters: Relatively large, warm trout streams

In Mayflies of Michigan Trout Streams, the Leonards report finding a single male adult of this species in late May. This is outside the range of emergence dates given by Knopp and Cormier in Mayflies: An Angler's Study of Trout Water Ephemeroptera .

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References

Arbona, Fred Jr. 1989. Mayflies, the Angler, and the Trout. Nick Lyons Books.
Knopp, Malcolm and Robert Cormier. 1997. Mayflies: An Angler's Study of Trout Water Ephemeroptera . The Lyons Press.
Leonard, Justin W. and Fannie A. Leonard. 1962. Mayflies of Michigan Trout Streams. Cranbrook Institute of Science.