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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 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.
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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Millcreek has attached these 4 pictures. The message is below.
Male 3.5 mm, excluding cerci.
Female 4mm, excluding cerci.
Male 3.5 mm, excluding cerci.
Healdsburg, CA

Posts: 344
Millcreek on Sep 17, 2015September 17th, 2015, 2:25 pm EDT
These nymphs were identified to genus using Merritt, Cummins and Berg (2008) as well as Buglab's "Key to Western Baetidae". They were keyed to species using Day's "New Genera of Mayflies From California" 1955, http://www.ephemeroptera-galactica.com/pubs/pub_d/pubdayw1955p121.pdf where it is described as Paracloeodes abitus (a synonym of Paracloeodes minutus). These were found in the Russian River, CA.

It's found in warm shallow water with a substrate of small gravel with a medium amount of algae attached. It's usually found in September.

The main ways of telling it apart from the other Baetidae are smaller size (3.5 - 4 mm), the claws being half the length of the tarsi and a labium shaped as shown above.
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