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.

Stream photos

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Sweltsa (Sallfly) Stonefly Nymph Sweltsa (Sallfly) Stonefly Nymph

Dorsal view of a Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the Yakima River in Washington

This species was fairly abundant in a February sample of the upper Yakima.

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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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Female Hydatophylax argus (Giant Cream Pattern-Wing Sedge) Caddisfly Adult Pictures

I had some trouble working through the genus key for this one because I'm not great at interpreting caddis wing venation. Fortunately, figure 19.707 in An Introduction to the Aquatic Insects of North America (Fifth Edition) shows the distinctive color pattern of the striking forewings on Hydatophylax argus, which is a perfect match for the pattern as well as venation. As there are no other species in that genus in this area, I can be pretty confident in the species ID.

Female Hydatophylax argus (Limnephilidae) (Giant Cream Pattern-Wing Sedge) Caddisfly Adult from the Teal River in Wisconsin

Ruler view of a Female Hydatophylax argus (Limnephilidae) (Giant Cream Pattern-Wing Sedge) Caddisfly Adult from the Teal River in Wisconsin The smallest ruler marks are 1 mm.

Lateral view of a Female Hydatophylax argus (Limnephilidae) (Giant Cream Pattern-Wing Sedge) Caddisfly Adult from the Teal River in Wisconsin

Ventral view of a Female Hydatophylax argus (Limnephilidae) (Giant Cream Pattern-Wing Sedge) Caddisfly Adult from the Teal River in Wisconsin

Artistic view of a Female Hydatophylax argus (Limnephilidae) (Giant Cream Pattern-Wing Sedge) Caddisfly Adult from the Teal River in Wisconsin

Dorsal view of a Female Hydatophylax argus (Limnephilidae) (Giant Cream Pattern-Wing Sedge) Caddisfly Adult from the Teal River in Wisconsin

This caddisfly was collected from the Teal River in Wisconsin on June 11th, 2021 and added to Troutnut.com by Troutnut on June 12th, 2021.

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References

Merritt R.W., Cummins, K.W., and Berg, M.B. 2019. An Introduction to the Aquatic Insects of North America (Fifth Edition). Kendall/Hunt Publishing Company.