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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.
Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

Lastchance
Portage, PA

Posts: 437
Lastchance on Jan 6, 2008January 6th, 2008, 7:46 am EST
Hi: I use to post under the name Goose,, but I lost my password and could never get back on. Hi again to all.....

Is the top 10 bug list still on the site? I really enjoyed it. This is an excellent site and learning tool.
Taxon
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Site Editor
Plano, TX

Posts: 1311
Taxon on Jan 6, 2008January 6th, 2008, 9:31 am EST
Bruce-

Top 10 Hatches is in the left column of this page.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
Martinlf
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Moderator
Palmyra PA

Posts: 3047
Martinlf on Jan 7, 2008January 7th, 2008, 12:35 am EST
Welcome back.
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell
JOHNW
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Chambersburg, PA

Posts: 452
JOHNW on Jan 7, 2008January 7th, 2008, 9:26 am EST
Bruce,
At least you won't find any "pretty blue bottles" in the top ten hatch list. ;)
JW
"old habits are hard to kill once you have gray in your beard" -Old Red Barn
Krachen
good ol P 'AYYY

Posts: 13
Krachen on Jan 8, 2008January 8th, 2008, 12:52 pm EST
Haha...Bruce and his Blue bottles...
Lastchance
Portage, PA

Posts: 437
Lastchance on Jan 10, 2008January 10th, 2008, 9:20 am EST
My bad. I missed the top 10 bugs list. YOU GOTTA LOVE THOSE PRETTY BLUE BOTTLES. I'll be in Somerset, NJ, with Chief. I hope NJ is prepared. Hope to see you all there.

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