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.

Waterfalls over smooth bedrock above Titcomb Lakes

From Titcomb Basin in Wyoming

Stream photos

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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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Near French Creek, PA

Lyrae has attached this picture to aid in identification. The message is below.

Lyrae
French Creek, PA

Posts: 1

Lyrae on May 13, 2007May 13th, 2007, 3:12 pm EDT

I saw this on my deck this evening. Anyone have any ideas? I only know enough to catch a few fish :)

Thanks.

GONZO
Site Editor
"Bear Swamp," PA

Posts: 1681

GONZO on May 13, 2007May 13th, 2007, 3:48 pm EDT

Lyrae,

Cool mayfly! I can't make out some of the details, but from the overall appearance it looks like a female Siphlonurus spinner to me.

Taxon

Site Editor
Plano, TX

Posts: 1311

Taxon on May 13, 2007May 13th, 2007, 4:03 pm EDT

That was my impression as well, also a female spinner. I'm thinking Siphlonurus alternatus. Don't see any Siphlonurus species listed for PA in my most trusted (national) source. However it's most likely incomplete in that regard.

Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

GONZO
Site Editor
"Bear Swamp," PA

Posts: 1681

GONZO on May 13, 2007May 13th, 2007, 4:19 pm EDT

Roger,

I can confirm that we do have Siphlonurus in PA. I've seen and even fished them on a few streams. Greg Hoover's 2002 survey of PA mayflies lists barbaroides, mirus, quebecensis, rapidus, and typicus as PA species.

Taxon

Site Editor
Plano, TX

Posts: 1311

Taxon on May 13, 2007May 13th, 2007, 4:35 pm EDT

Gonzo-

Well, we seem to be in violent agreement on genus. And after all, identification to species based on a photograph of a female imago is problematic, at best. However, as Konchu has observed, it is fun.

Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

GONZO
Site Editor
"Bear Swamp," PA

Posts: 1681

GONZO on May 13, 2007May 13th, 2007, 4:54 pm EDT

Agreed, Roger, it is fun to guess. I was tempted to guess quebecensis, but the only species I can reasonably rule out is mirus.