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Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York
Blue-winged Olives

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

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.

Oldredbarn has attached these 5 pictures. The message is below.
1995 Madison River 23.5" Brown. Eric Swedman & Spence
1995 Eric Shores with Spence's torpedo Brown...Who loves wild trout?!
Why do we all have one of these shots? Rod in mouth? This shot was for the Michigan Fly Fishing Club because the Loomis rod there I won at my first club meeting after I had paid my dues.
Madison River Bow 1995...Took a size 16 Bill Monahan version of a Partridge Caddis...What a healthy specimen!
Yellowstone Park Elk...I'm on the opposite bank of a skinny raging little creek and I could not get him to lift his head for the shot. I'm jumping up and down shouting etc and finally! I bet he's happy I'm a vegetarian!
Oldredbarn's profile picture
Novi, MI

Posts: 2600
Oldredbarn on May 21, 2010May 21st, 2010, 2:22 am EDT
This is for Jesse and Matt...My contribution to the east/midwest vs Montana undercard...And in this corner...etc.

I have finally purchased a small Canon digital camera (Thanks Wiflyfisher!), but prior to now I had a Nikon F3 which, in comparrison is like carrying a frig around your neck...

Anyway, I'm heading up tomorrow to fish and I hope to play with my new camera a bit, when I'm not poking trout...

I am trying to add a couple pictures here from my trip out west in 1995. If this works there are two Eric's in the photos with me...Eric Swedman holding Mr Big. He's the manager of Madison River Fishing Co in Ennis...The other Eric holding that torpedo of a wild, healthy, Madison river Brown is Eric Shores and he guides out of MRFC.

I'm geeked about heading up and I'm trying to calm myself down a bit, but these photos aren't helping...

See you in a week or so!


PS How about those old Red Ball Lightweights! They were in style once for a minute...
"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
Jesse's profile picture
Posts: 378
Jesse on Jun 12, 2010June 12th, 2010, 6:01 am EDT
Hahah Spence bud thats freaking awsome and those pictures just really help to distinguish the diversity in fishing eastern vs. western waters. The fish are beautiful, the scenery, the wildlife...its all just absolutely breathtaking. Sorry it's taken me so long to get back to you buddy ive just been so busy getting back home, trying to make some money, and then figuring out plans for an already near future for going back to Montana. I haven't had that much time to get on and check things out, but it's always good to come back to some pictures like these ones. Your bug shots were great too so no need to be modest about it aha! Good day to you buddy ill be checking more often now!
Most of us fish our whole lives..not knowing its not the fish that we are after.

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