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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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Kogotus Stonefly Nymph Kogotus Stonefly Nymph

Dorsal view of a Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington

This one pretty clearly keys to Kogotus, but it also looks fairly different from specimens I caught in the same creek about a month later in the year. With only one species of the genus known in Washington, I'm not sure about the answer to this ID.

8 Recently Added Photos

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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Updates from June 7, 2021

Updates from June 7, 2021

Photos by Troutnut

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

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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.

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Male Dibusa angata (Microcaddis) Caddisfly Adult

Male Dibusa angata (Hydroptilidae) (Microcaddis) Caddisfly Adult from the Namekagon River in Wisconsin

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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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References

Morse, JC. 1972. The genus Nyctiophylax in North America. Journal of the Kansas Entomological Society 42(2): 172-181.

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