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Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin
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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27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.
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Photos by Troutnut

Closeup insects by Troutnut from the Teal River and the Namekagon River in Wisconsin

12
Nyctiophylax affinis (Dinky Light Summer Sedge) Caddisfly Adult
Nyctiophylax affinis (Polycentropodidae) (Dinky Light Summer Sedge) Caddisfly Adult from the Teal River in Wisconsin
This specimen is certainly Nyctiophylax and most likely Nyctiophylax affinis. I don't know my caddisfly parts well enough to definitively follow the Nyctiophylax key in Morse (1972), but that source states that affinis is the predominant Midwestern species, being widespread and common in the region where I found this one. The anatomy of this one seems to match those at least as well as the other two potential options based on range, Nyctiophylax uncus and Nyctiophylax banksi.
14
Male Dibusa angata (Microcaddis) Caddisfly Adult
Male Dibusa angata (Hydroptilidae) (Microcaddis) Caddisfly Adult from the Namekagon River in Wisconsin
10
Male Mystacides (Black Dancer) Caddisfly Adult
Lateral view of a Male Mystacides (Leptoceridae) (Black Dancer) Caddisfly Adult from the Namekagon River in Wisconsin
5
Eurylophella (Chocolate Dun) Mayfly Nymph
Dorsal view of a Eurylophella (Ephemerellidae) (Chocolate Dun) Mayfly Nymph from the Namekagon River in Wisconsin
4
Stenonema (March Browns and Cahills) Mayfly Nymph
Dorsal view of a Stenonema (Heptageniidae) (March Browns and Cahills) Mayfly Nymph from the Namekagon River in Wisconsin
9
Female Cheumatopsyche (Little Sister Sedge) Caddisfly Adult
Lateral view of a Female Cheumatopsyche (Hydropsychidae) (Little Sister Sedge) Caddisfly Adult from the Namekagon River in Wisconsin
This one has a body a little bit over 6 mm long.
9
Male Stenonema terminatum Mayfly Spinner
Male Stenonema terminatum (Heptageniidae) Mayfly Spinner from the Teal River in Wisconsin

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