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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 Glossosoma (Glossosomatidae) (Little Brown Short-horned Sedge) Caddisfly Larva from the Yakima River in Washington
I caught this tiny larva without a case, but it seems to key pretty clearly to to Glossosomatidae. From there, the lack of sclerites on the mesonotum points to either Glossosoma or Anagapetus. Although it's difficult to see in a 2D image from the microscope, it's pretty clear in the live 3D view that the pronotum is only excised about 1/3 of its length to accommodate the forecoxa, not 2/3, which points to Glossosoma at Couplet 5 of the Key to Genera of Glossosomatidae Larvae.
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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Updates from October 4, 2011

Updates from October 4, 2011

Closeup insects by Bnewell from the Touchet River in Washington

Onocosmoecus unicolor (Limnephilidae) (Great Late-Summer Sedge) Caddisfly Adult from the Touchet River in Washington
Male Paraleptophlebia bicornuta (Leptophlebiidae) (Mahogany Dun) Mayfly Dun from the Touchet River in Washington
You wonder sometimes how certain insects get their common names. This one is called the 'mahogany dun' for some unknown reason.

Comments / replies

Entoman
Entoman's profile picture
Northern CA & ID

Posts: 2604
Entoman on Oct 6, 2011October 6th, 2011, 9:09 am EDT
Hi Bob,

You wonder sometimes how certain insects get their common names. This one is called the 'mahogany dun' for some unknown reason.

Yeah, I agree with you that Blue Quill (defined as a dun hackled, peacock quill bodied fly) is a better handle for this specimen. As to why it's stuck with the name Mahogany Dun, I'm afraid it is a victim of lumping as important species of leptophlebiids are mahogany colored. Important baetids go by the name Blue-Winged Olive in spite of having brown bodies for the same unfortunate reason.

Regards,

Kurt
"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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