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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.

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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.

Updates from June 16, 2018

Updates from June 16, 2018

Photos by Troutnut from the South Fork Snoqualmie River in Washington

Closeup insects by Troutnut from the South Fork Snoqualmie River in Washington

5
Ephemerella excrucians Mayfly Nymph

10
Drunella grandis Mayfly Nymph

12
Female Pictetiella expansa Stonefly Adult

Based on photos, this specimen seems to key out (using Merritt & Cummins 4th Edition) to Pictetiella expansa, but some of the characteristics aren't 100 % clear. Frisonia picticeps is another possibility. The range map doesn't show Pictiella expansa in Washington, but that species is listed elsewhere as occurring near Puget Sound, and the head markings are similar to (albeit not a perfect match for) those of [link url=https://www.researchgate.net/figure/head-and-pronotum-dorsal-Pictetiella-expansa-Boulder-Co-Colorado-North-Fork-Middle_fig1_315373449]a male from Colorado in the scientific literature.

11
Male Ephemerellidae Mayfly Dun

6
Female Rhithrogena virilis Mayfly Dun

I'm guessing this one is Rhithrogena virilis based on collection of a male spinner of similar size and body configuration during the same trip.

8
Male Rhithrogena virilis Mayfly Spinner

I'm guessing this is Rhithrogena virilis based on resemblance to a similar specimen collected last year.

6
Neoleptophlebia Mayfly Nymph

7
Female Cinygmula Mayfly Dun

I'm calling this one Cinygmula just based on the general look and the fact that the genus is very common in this river. Official keys can't rule out other Heptageniidae, though.

3
Acari Arthropod Adult

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