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.

Looking across Island Lake toward the Titcomb Basin—one of the popular crown jewels of the Wind River Mountains

From Island Lake in Wyoming

Stream photos

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Pycnopsyche guttifera (Great Autumn Brown Sedge) Caddisfly Larva Pycnopsyche guttifera (Great Autumn Brown Sedge) Caddisfly Larva

Dorsal view of a Pycnopsyche guttifera (Limnephilidae) (Great Autumn Brown Sedge) Caddisfly Larva from the Yakima River in Washington

This specimen appears to be of the same species as this one collected in the same spot two months earlier. The identification of both is tentative. This one suffered some physical damage before being photographed, too, so the colors aren't totally natural. I was mostly photographing it to test out some new camera setting idea, which worked really well for a couple of closeups.

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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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Stonefly Species Sierracapnia barberi (Little Snowflies)

Species Range

source

Physical description

Most physical descriptions on Troutnut are direct or slightly edited quotes from the original scientific sources describing or updating the species, although there may be errors in copying them to this website. Such descriptions aren't always definitive, because species often turn out to be more variable than the original describers observed. In some cases, only a single specimen was described! However, they are useful starting points.

Description from GBIFthe Global Biodiversity Information Facility

Source: Sierracapnia, A New Genus Of Capniidae (Plecoptera) From Western North America

Male. Tergum 7 knob narrow and unnotched (knob height 20 - 25 % of segment 7 height; knob width 9 - 13 % of segment 7 width) (Figs. 2, 3). Epiproct in dorsal view narrow, lateral margins sinuous (Fig. 1); maximum width 15 - 21 % of epiproct length; apex acutely pointed; posterior third of epiproct with narrow ventrolateral flange; dorsal membrane light colored. Epiproct in lateral view slightly convex dorsally, deeply keeled ventrally; maximum depth 30 - 35 % of length; maximum depth near middle of epiproct; basal neck narrow (Fig. 2). Epiproct dorsolateral horns arch above main dorsal surface; horn length 22 - 25 % epiproct length; horn tips extend forward to 70 - 78 % epiproct length (Fig. 2, Table 1).

Female. Subgenital plate heavily sclerotized and dark, covering entire width of sternum 8 and posterior portion of sternum 7 (Fig. 211, Nelson and Baumann 1989).

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