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

Blue-winged Olives
Baetis

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.

Sunlight perfectly strikes the trees at a bend in the Foss River in the Washington Cascades.

From the Foss River in Washington

Stream photos

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Neoleptophlebia Mayfly Nymph Neoleptophlebia Mayfly Nymph

Dorsal view of a Neoleptophlebia (Leptophlebiidae) Mayfly Nymph from the Yakima River in Washington

Some characteristics from the microscope images for the tentative species id: The postero-lateral projections are found only on segment 9, not segment 8. Based on the key in Jacobus et al. (2014), it appears to key to Neoleptophlebia adoptiva or Neoleptophlebia heteronea, same as this specimen with pretty different abdominal markings. However, distinguishing between those calls for comparing the lengths of the second and third segment of the labial palp, and this one (like the other one) only seems to have two segments. So I'm stuck on them both. It's likely that the fact that they're immature nymphs stymies identification in some important way.

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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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Yellowstone in September

Report at a Glance

General Region	West Yellowstone, MT
Dates Fished	9/13 - 9/19/2014
Time of Day	all day
Fish Caught	Rainbows & brown trout
Conditions & Hatches	warm, sunny most of the time... BWOs, Callibaetis spinners, White Miller caddis, fly ants, bright green-bodied mayfly, small dark brown caddis

Details and Discussion

Wiflyfisher

Wisconsin

Posts: 622

Wiflyfisher on Sep 28, 2014September 28th, 2014, 8:26 am EDT

Sorry, to lazy to retype it.. full story is here on my blog...

http://flypatternsfortrout.com/2014/09/28/fly-fishing-west-yellowstone-september/

John S.
https://WiFlyFisher.com

Oldredbarn

Novi, MI

Posts: 2600

Oldredbarn on Sep 28, 2014September 28th, 2014, 1:20 pm EDT

John,

Wonderful! Glad to see you guys had such a great time...Hard not to out there, eh?!

Was that thunder in that vid on the Firehole?

I really want to visit sometime closer to Fall myself. I always seem to end up there at the end of July-August...Latest being just before Labor Day in 2004.

Got to love Jim's breakfast! This last time out we fished one night in that run below the dam and just above Jim's place.

What's not to love about the Madison?! It is a great place to fish.

Thanks for the report.

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