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.

Stream photos

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Perlodidae (Springflies and Yellow Stones) Stonefly Nymph Perlodidae (Springflies and Yellow Stones) Stonefly Nymph

Artistic view of a Perlodidae (Springflies and Yellow Stones) Stonefly Nymph from the Yakima River in Washington

This one seems to lead to Couplet 35 of the Key to Genera of Perlodidae Nymphs and the genus Isoperla, but I'm skeptical that's correct based on the general look. I need to get it under the microscope to review several choices in the key, and it'll probably end up a different Perlodidae.

11 Recently Added Photos

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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Now that's aBWO!!

Female Ephemerella excrucians (Pale Morning Dun) Mayfly Spinner

11 Pictures

Lateral view of a Female Ephemerella excrucians (Ephemerellidae) (Pale Morning Dun) Mayfly Spinner from the Bois Brule River in Wisconsin

Collected June 30, 2005 from the Bois Brule River in Wisconsin

Added by Troutnut on April 22, 2006

Collected June 30, 2005 from the Bois Brule River in Wisconsin and added by Troutnut on April 22, 2006

Adirman

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

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