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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.

Lateral view of a Onocosmoecus (Limnephilidae) (Great Late-Summer Sedge) Caddisfly Larva from the Yakima River in Washington
This specimen keys pretty easily to Onocosmoecus, and it closely resembles a specimen from Alaska which caddis expert Dave Ruiter recognized as this genus. As with that specimen, the only species in the genus documented in this area is Onocosmoecus unicolor, but Dave suggested for that specimen that there might be multiple not-yet-distinguished species under the unicolor umbrella and it would be best to stick with the genus-level ID. I'm doing the same for this one.
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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Mahones41 has attached these 2 pictures to aid in identification. The message is below.
Mahones41
Mahones41's profile picture
Posts: 11
Mahones41 on Feb 22, 2012February 22nd, 2012, 12:34 pm EST
hey all,

so i am almost certain this is a stonefly. but i was wondering if it would be considered a 'tiny' one. i have seen what i though were tiny black stone flies that are only a qatar of the size of this one thanks for any info. the picture was taken in Monroe County, PA around 1230.
Lastchance
Portage, PA

Posts: 437
Lastchance on Feb 22, 2012February 22nd, 2012, 1:06 pm EST
Yep, that's it. I saw a bunch on Sunday.
Bruce
Entoman
Entoman's profile picture
Northern CA & ID

Posts: 2604
Entoman on Mar 23, 2012March 23rd, 2012, 4:34 pm EDT
Sorry Mahones, don't know how this one slipped by without trying to help. This looks like a species of the Taeniopterygidae (Willowfly) family. They are tiny stonefies arent they? They can get much smaller though, even half that size!
"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

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