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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 Limnephilidae (Giant Sedges) Caddisfly Larva from the Yakima River in Washington
This specimen resembled several others of around the same size and perhaps the same species, which were pretty common in my February sample from the upper Yakima. Unfortunately, I misplaced the specimen before I could get it under a microscope for a definitive ID.
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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Trnnflt has attached this picture to aid in identification. The message is below.
Trnnflt
Trnnflt's profile picture
Jackson Wyoming

Posts: 1
Trnnflt on Jan 1, 2017January 1st, 2017, 10:58 pm EST
Saw this brown mayfly on my door the august morning i arrived in jackson hole at the Elk Refuge Hotel cross the road from flat creek in Jackson Hole.
I'm new to learning about these aquatic insects and wondered what this one is?
Millcreek
Healdsburg, CA

Posts: 344
Millcreek on Jan 2, 2017January 2nd, 2017, 3:29 am EST
Michael- It looks like a male subimago Callibaetis species.


"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein
Taxon
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Site Editor
Plano, TX

Posts: 1311
Taxon on Jan 2, 2017January 2nd, 2017, 3:31 am EST
Hi Michael-

I believe your avatar image to be that of a male subimago (dun) of genus Callibaetis, which is also known by the common name of Speckledwinged Dun, among numerous others.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

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