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.
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.
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