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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 Grammotaulius betteni (Limnephilidae) (Northern Caddisfly) Caddisfly Larva from the Yakima River in Washington
This is a striking caddis larva with an interesting color pattern on the head. Here are some characteristics I was able to see under the microscope, but could not easily expose for a picture:
- The prosternal horn is present.
- The mandible is clearly toothed, not formed into a uniform scraper blade.
- The seems to be only 2 major setae on the ventral edge of the hind femur.
- Chloride epithelia seem to be absent from the dorsal side of any abdominal segments.
Based on these characteristics and the ones more easily visible from the pictures, this seems to be Grammotaulius. The key's description of the case is spot-on: "Case cylindrical, made of longitudinally arranged sedge or similar leaves," as is the description of the markings on the head, "Dorsum of head light brownish yellow with numerous discrete, small, dark spots." The spot pattern on the head is a very good match to figure 19.312 of Merritt R.W., Cummins, K.W., and Berg, M.B. (2019). The species ID is based on Grammotaulius betteni being the only species of this genus known in Washington state.
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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Crepuscular has attached these 2 pictures to aid in identification. The message is below.
Crepuscular
Crepuscular's profile picture
Boiling Springs, PA

Posts: 920
Crepuscular on Feb 24, 2012February 24th, 2012, 10:13 am EST
Here is a crappy photo of the olives present on the letort recently
Entoman
Entoman's profile picture
Northern CA & ID

Posts: 2604
Entoman on Feb 24, 2012February 24th, 2012, 12:12 pm EST
Wished the hind wing was in better focus, but I'm thinking probably B. tricaudatus (prev. B. vagans), a male subimago.
"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
Oldredbarn
Oldredbarn's profile picture
Novi, MI

Posts: 2600
Oldredbarn on Feb 24, 2012February 24th, 2012, 12:18 pm EST
Kurt,

By any other name they would still taste as sweet...I'm getting tears in my eyes! I'm sitting here and these are already hatching in the stream somewhere! I better get cracking! :)

Now there's a gorgious color to match you hatch matcher! Thanks Eric!

Spence

"Even when my best efforts fail it's a satisfying challenge, and that, after all, is the essence of fly fishing." -Chauncy Lively

"Envy not the man who lives beside the river, but the man the river flows through." Joseph T Heywood
Entoman
Entoman's profile picture
Northern CA & ID

Posts: 2604
Entoman on Feb 24, 2012February 24th, 2012, 4:22 pm EST
Me too, Spence...

Thanks for the second photo, Eric. I don't see anything in it that would change my mind. Cool photo by the way! Vibrant colors and an interestingly rustic looking background. I've been scratching my head trying to figure out what the critter is resting on.:)
"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
Crepuscular
Crepuscular's profile picture
Boiling Springs, PA

Posts: 920
Crepuscular on Feb 27, 2012February 27th, 2012, 10:00 am EST
Its on my vice, I thought the renzetti o-ring would give it away.
Entoman
Entoman's profile picture
Northern CA & ID

Posts: 2604
Entoman on Feb 27, 2012February 27th, 2012, 4:12 pm EST
Ah, I'm not all that familiar with Renzettis, other than seeing them in shops and catelogs. I can recognize them easily enough with the whole vice in view, but that isn't quite the same as a close-up photo or tying flies for years on one inches in front of my face.:)
"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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