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.

A small spring creek in Wisconsin. A little brook trout stream tumbles over boulders

Stream photos

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Limnephilus (Summer Flier Sedge) Caddisfly Larva Limnephilus (Summer Flier Sedge) Caddisfly Larva

Case view of a Limnephilus (Limnephilidae) (Summer Flier Sedge) Caddisfly Larva from the Yakima River in Washington

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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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Baetis alius

Millcreek has attached these 4 pictures to aid in identification. The message is below.

Millcreek
Healdsburg, CA

Posts: 344

Millcreek on Jan 24, 2015January 24th, 2015, 1:07 pm EST

This mayfly was collected from the Russian River near Healdsburg, Ca. It's common from March through October. It's usually found in shallow water 3-12 inches deep and relatively free of silt with a bottom of sand, gravel and cobble.

It's fairly easy to identify from the dorsal side of the abdomen with section five, nine and ten being mostly light in color. It's also got a mouth with labial palpi having the inner margin of segment 2 slightly convex to nearly straight as opposed to variously concave. It also has the first gill much smaller than the others.

Descriptions to genus were from Merritt, Cummins and Berg (2008). The descriptions to species were from Morihara and McCafferty (1997) "The Baetis Larvae of North America (Baetidae: Ephemeroptera).
http://www.ephemeroptera-galactica.com/pubs/pub_m/pubmoriharad1979p139.pdf
and MacCafferty, Meyer, Randolph and Webb (2008) "Evaluation of Mayfly Species Originally Described as Baetis Leach (Ephemeroptera: Baetidae)From California.
http://www.ephemeroptera-galactica.com/pubs/pub_m/pubmccaffertyw2008p577.pdf

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