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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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Stonefly Genus Leuctra (Needleflies)

Ernest Schwiebert notes in Matching the Hatch that trout are very fond of these uncommon stoneflies when they are available.

Where & when

In 26 records from GBIF, adults of this genus have been collected during June (42%), August (27%), May (19%), and July (12%).

In 8 records from GBIF, this genus has been collected at elevations ranging from 52 to 4203 ft, with an average (median) of 1394 ft.

Genus Range

Start a Discussion of Leuctra

References

Stonefly Genus Leuctra (Needleflies)

Taxonomy
17 species (Leuctra alabama, Leuctra alexanderi, Leuctra alta, Leuctra baddecka, Leuctra biloba, Leuctra cottaquilla, Leuctra crossi, Leuctra grandis, Leuctra laura, Leuctra mitchellensis, Leuctra monticola, Leuctra nephophila, Leuctra paleo, Leuctra rickeri, Leuctra szczytkoi, Leuctra tenius, and Leuctra truncata) aren't included.
Genus Range
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