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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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Lateral view of a Female Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Spinner from the Bois Brule River in Wisconsin
Adirman
Adirman's profile picture
Monticello, NY

Posts: 479
Adirman on Sep 10, 2010September 10th, 2010, 3:15 am EDT
That Attenuata looks like it truly has the olive body, more so than any BWO pic i've seen yet! Wah tsize would that be tied in to imitate?

Thanks,

Adirman
GONZO
Site Editor
"Bear Swamp," PA

Posts: 1681
GONZO on Sep 10, 2010September 10th, 2010, 4:31 am EDT
A-man,

The size of A. attenuata is usually around 6-7mm (or somewhere around a #16-18). However, this species is also notorious for creating confusion in fly-fishing literature and getting credit for being a more significant hatch than it probably is. I have some doubts that any of the mayflies pictured in the A. attenuata section are actually that species.
Taxon
Taxon's profile picture
Site Editor
Plano, TX

Posts: 1311
Taxon on Sep 10, 2010September 10th, 2010, 4:36 am EDT
Adirman-

The male dun and spinner would have a body length of ~6mm, which would translate to hook size #18, and the female would be slightly longer.

EDIT:

Lloyd,

Oh shoot, we've done it again.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

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