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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 Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington
This one pretty clearly keys to Kogotus, but it also looks fairly different from specimens I caught in the same creek about a month later in the year. With only one species of the genus known in Washington, I'm not sure about the answer to this 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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Braindead has attached this picture to aid in identification. The message is below.
Braindead
Niwot, Colorado

Posts: 2
Braindead on Aug 9, 2013August 9th, 2013, 11:34 am EDT
Greetings from Colorado. I'm a new member of the troutnut site and have a question of those knowledgeable about mayflies. Earlier this year I had the privilege of getting to fish a private lake up near Estes Park, Colorado. I fished with 4 other friends from canoe, row boat and yes even a paddle boat. Near the end of our morning, a mayfly landed on my little finger and I managed to get a quick snapshot of it (attached).

Any idea what this little critter is? I've looked around this and a few other sites but can't positively identify it.

Thanks!

Chester Shans
Taxon
Taxon's profile picture
Site Editor
Plano, TX

Posts: 1311
Taxon on Aug 9, 2013August 9th, 2013, 3:05 pm EDT
Hi Chester-

Welcome to the troutnut forum. The mayfly on your finger in the attached photo is a male imago (spinner) of genus Callibaetis, probably Callibaetis ferrugineus hageni.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
Entoman
Entoman's profile picture
Northern CA & ID

Posts: 2604
Entoman on Aug 9, 2013August 9th, 2013, 4:10 pm EDT
I agree.
"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman
Braindead
Niwot, Colorado

Posts: 2
Braindead on Aug 9, 2013August 9th, 2013, 6:22 pm EDT
Thanks much for the speedy reply. My fly fishing friends and I appreciate the quick answer.

Chester
Taxon
Taxon's profile picture
Site Editor
Plano, TX

Posts: 1311
Taxon on Aug 9, 2013August 9th, 2013, 7:06 pm EDT
You are certainly welcome, Chester. It was our pleasure to be able to help you and your fly fishing friends.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

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