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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Re: UV spectrum and trout
In General Discussion by Martinlf

Re: closing the gender gap in flyfishing
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Re: Fishing Kupa River, Slovenia
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Re: Clinger nymphs are shaped that way to hang in really fast currents. Really?
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Mayfly Species Nixe lucidipennis

Where & when

The only fly fishing book in which I've found a mention of this species is Mayflies, the Angler, and the Trout. Arbona says there are "fair hatches" of in northern Wisconsin and Michigan, although it has not turned up in my samples.