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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Stonefly Species Nemocapnia carolina (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: The Winter Stoneflies (Plecoptera: Capniidae) Of Mississippi

Male epiproct. Epiproct a single, slender, cylindrical, probe, bearing an apical orifice (Figs. 52, 55); dorsal surface relatively smooth but bearing a prominent suture; epiproct carried in an upright position in most specimens (Fig. 54). Male tergal process. Abdominal tergum 8 without process, but tergum 9 bears a low knob lateral to epiproct on either side of segment (Figs. 53, 55 - 57).

Female subgenital plate. Abdominal sterna 7 and 8 completely separated by membrane. Mesal portion of sternum 8 divided into a large, somewhat mushroom shaped anterior sclerite and a narrow, transverse posterior sclerite (Figs. 58, 66). Source: Records Of An Uncommon Stonefly, Nemocapnia Carolina Banks (Plecoptera: Capniidae), In South Carolina And Nearby States

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