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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.

Dorsal view of a Holocentropus (Polycentropodidae) Caddisfly Larva from the Yakima River in Washington
This one seems to tentatively key to Holocentropus, although I can't make out the anal spines in Couplet 7 of the Key to Genera of Polycentropodidae Larvae nor the dark bands in Couplet 4 of the Key to Genera of Polycentropodidae Larvae, making me wonder if I went wrong somewhere in keying it out. I don't see where that could have happened, though. It might also be that it's a very immature larva and doesn't possess all the identifying characteristics in the key yet. If Holocentropus is correct, then Holocentropus flavus and Holocentropus interruptus are the two likely possibilities based on range, but I was not able to find a description of their larvae.
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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Caddisfly Species Limnephilus sericeus (Summer Flier Sedges)

Where & when

Preferred waters: Stillwaters or streams of any size

In 121 records from GBIF, adults of this species have mostly been collected during August (26%), September (25%), July (22%), June (17%), and October (7%).

In 78 records from GBIF, this species has been collected at elevations ranging from 3 to 8005 ft, with an average (median) of 789 ft.

Species Range

Start a Discussion of Limnephilus sericeus

References

Caddisfly Species Limnephilus sericeus (Summer Flier Sedges)

Taxonomy
Species Range
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