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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This one seems to lead to Couplet 35 of the Key to Genera of Perlodidae Nymphs and the genus Isoperla, but I'm skeptical that's correct based on the general look. I need to get it under the microscope to review several choices in the key, and it'll probably end up a different Perlodidae.
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Fly Angler's Glossary of Aquatic Entomology
Fly Angler's Glossary of Aquatic Entomology
I use a lot of fly fishing, photography, and especially entomology jargon on this site. The site incorporates these definitions wherever they're used, but and this page lists together every single form of every term used on this site.
You can also click a link from one of the in-line definitions across the site to come to its full definition page, seeing sub-definitions used within it highlighted and illustrated.