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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Cicadas
This common name refers to only one family. Click its scientific name to learn more.
True Bug Family Cicadidae
These are pretty much always called Cicadas.
Though they aren't aquatic, cicadas can end up on the surface of trout streams in great numbers in the rare years when they swarm our forests by the tens of millions. It stands to reason that trout would gorge themselves on cicadas at such times, and I have heard reports of it but never been lucky enough to witness the "cicada hatch" myself.
I found this cicada and several like it in the grass near my car as I put my waders on. Some of them were singing in the trees above the river, too, but I did not see any fall into the water.