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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.

This view of the pipeline, the Atigun River, and an impressive sunset/rise was one of my first views of the North Slope as I came through Atigun Pass in the middle of the night. From the Atigun River in Alaska

Stream photos

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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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Closeup insects by Troutnut and Bnewell from the Namekagon River and the Vermillion River in Wisconsin and Montana

9
Hexagenia limbata (Hex) Mayfly Nymph
Hexagenia limbata (Ephemeridae) (Hex) Mayfly Nymph from the Namekagon River in Wisconsin
7
Male Neoleptophlebia mollis (Jenny Spinner) Mayfly Dun
Lateral view of a Male Neoleptophlebia mollis (Leptophlebiidae) (Jenny Spinner) Mayfly Dun from the Namekagon River in Wisconsin
4
Caenis (Angler's Curse) Mayfly Nymph
Dorsal view of a Caenis (Caenidae) (Angler's Curse) Mayfly Nymph from the Namekagon River in Wisconsin
5
Female Stenonema (March Browns and Cahills) Mayfly Dun
Lateral view of a Female Stenonema (Heptageniidae) (March Browns and Cahills) Mayfly Dun from the Namekagon River in Wisconsin
4
Female Epeorus vitreus (Sulphur) Mayfly Dun
Female Epeorus vitreus (Heptageniidae) (Sulphur) Mayfly Dun from the Namekagon River in Wisconsin
3
Eurylophella (Chocolate Dun) Mayfly Nymph
Dorsal view of a Eurylophella (Ephemerellidae) (Chocolate Dun) Mayfly Nymph from the Namekagon River in Wisconsin
2
Siphlonurus alternatus (Gray Drake) Mayfly Nymph
Dorsal view of a Siphlonurus alternatus (Siphlonuridae) (Gray Drake) Mayfly Nymph from the Namekagon River in Wisconsin
3
Male Attenella attenuata (Blue-Winged Olive) Mayfly Dun
Lateral view of a Male Attenella attenuata (Ephemerellidae) (Blue-Winged Olive) Mayfly Dun from the Namekagon River in Wisconsin
This specimen came from the same hatch as a female.
4
Female Attenella attenuata (Blue-Winged Olive) Mayfly Dun
Lateral view of a Female Attenella attenuata (Ephemerellidae) (Blue-Winged Olive) Mayfly Dun from the Namekagon River in Wisconsin
This specimen came from the same hatch as a male.
2
Stenonema mediopunctatum (Cream Cahill) Mayfly Nymph
Dorsal view of a Stenonema mediopunctatum (Heptageniidae) (Cream Cahill) Mayfly Nymph from the Namekagon River in Wisconsin
4
Stenonema mediopunctatum (Cream Cahill) Mayfly Nymph
Dorsal view of a Stenonema mediopunctatum (Heptageniidae) (Cream Cahill) Mayfly Nymph from the Namekagon River in Wisconsin
3
Baetisca laurentina (Armored Mayfly) Mayfly Nymph
Dorsal view of a Baetisca laurentina (Baetiscidae) (Armored Mayfly) Mayfly Nymph from the Namekagon River in Wisconsin
5
Ephemerella needhami (Little Dark Hendrickson) Mayfly Nymph
There are postero-lateral projections on adominal segments 4-9. Dorsal view of a Ephemerella needhami (Ephemerellidae) (Little Dark Hendrickson) Mayfly Nymph from the Namekagon River in Wisconsin
I took quite a few notes at the microscope when I collected this specimen. They're attached to the appropriate pictures. I found this specimen in the same collection as a similar one. Since I only have strange views of this one, it's possible that they're actually the same specimen and I somehow confused my picture-ordering and got the impression that they're different nymphs.
3
Ephemerella needhami (Little Dark Hendrickson) Mayfly Nymph
Dorsal view of a Ephemerella needhami (Ephemerellidae) (Little Dark Hendrickson) Mayfly Nymph from the Namekagon River in Wisconsin
2
Ephemerella (Hendricksons, Sulphurs, PMDs) Mayfly Nymph
Ventral view of a Ephemerella (Ephemerellidae) (Hendricksons, Sulphurs, PMDs) Mayfly Nymph from the Namekagon River in Wisconsin
I found this specimen in the same collection as a similar one. Since I only have strange views of this one, it's possible that they're actually the same specimen and I somehow confused my picture-ordering and got the impression that they're different nymphs.
1
Alloperla (Sallfly) Stonefly Nymph
Alloperla (Chloroperlidae) (Sallfly) Stonefly Nymph from the Vermillion River in Montana

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