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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
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.

Lateral view of a Clostoeca disjuncta (Limnephilidae) (Northern Caddisfly) Caddisfly Larva from the Yakima River in Washington
This one was surprisingly straightforward to identify. The lack of a sclerite at the base of the lateral hump narrows the field quite a bit, and the other options followed fairly obvious characteristics to Clostoeca, which only has one species, Clostoeca disjuncta.
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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Male Calineuria californica (Golden Stone) Stonefly Adult Pictures

A few of these larger stoneflies were fluttering around the South Fork on an evening dominated by much smaller species.

This one has been difficult to identify. I can't spot any of the gill remnants characteristic of Perlidae, but the wing venation seems to point in that direction. I tried keying it out as Perlodidae but arrived at Isoperla, every western species of which has significantly smaller bodies than this one.

Edit: See forum comments for a likely correct identification.

Lateral view of a Male Calineuria californica (Perlidae) (Golden Stone) Stonefly Adult from the South Fork Snoqualmie River in Washington
Male Calineuria californica (Perlidae) (Golden Stone) Stonefly Adult from the South Fork Snoqualmie River in Washington
Male Calineuria californica (Perlidae) (Golden Stone) Stonefly Adult from the South Fork Snoqualmie River in Washington
Ventral view of a Male Calineuria californica (Perlidae) (Golden Stone) Stonefly Adult from the South Fork Snoqualmie River in Washington
Ruler view of a Male Calineuria californica (Perlidae) (Golden Stone) Stonefly Adult from the South Fork Snoqualmie River in Washington The smallest ruler marks are 1 mm.
Male Calineuria californica (Perlidae) (Golden Stone) Stonefly Adult from the South Fork Snoqualmie River in Washington
Male Calineuria californica (Perlidae) (Golden Stone) Stonefly Adult from the South Fork Snoqualmie River in Washington
Male Calineuria californica (Perlidae) (Golden Stone) Stonefly Adult from the South Fork Snoqualmie River in Washington
Male Calineuria californica (Perlidae) (Golden Stone) Stonefly Adult from the South Fork Snoqualmie River in Washington
Taken with my usual glare-reducing polarized light and filter.

Male Calineuria californica (Perlidae) (Golden Stone) Stonefly Adult from the South Fork Snoqualmie River in Washington
Taken without my usual glare-reducing polarized light and filter, so the glare might enhance some details.

Male Calineuria californica (Perlidae) (Golden Stone) Stonefly Adult from the South Fork Snoqualmie River in Washington
Taken without my usual glare-reducing polarized light and filter, so the glare might enhance some details.

Male Calineuria californica (Perlidae) (Golden Stone) Stonefly Adult from the South Fork Snoqualmie River in Washington
Taken with my usual glare-reducing polarized light and filter.

Male Calineuria californica (Perlidae) (Golden Stone) Stonefly Adult from the South Fork Snoqualmie River in Washington
Male Calineuria californica (Perlidae) (Golden Stone) Stonefly Adult from the South Fork Snoqualmie River in Washington
I plan to try to start capturing wing venation in more of my photos for better identifiability.

Dorsal view of a Male Calineuria californica (Perlidae) (Golden Stone) Stonefly Adult from the South Fork Snoqualmie River in Washington

This stonefly was collected from the South Fork Snoqualmie River in Washington on July 20th, 2019 and added to Troutnut.com by Troutnut on July 22nd, 2019.

Discussions of this Adult

Hesperoperla or Calineuria
2 replies
Posted by Millcreek on Jul 22, 2019
Last reply on Jul 22, 2019 by Millcreek
Hesperoperla or Calineuria. Just a guess. These are similar to ones I've netted in California. The gill remnants don't always show and can be difficult to spot when they do. The size is right and the wing veining as well.

Here's a picture at bugguide of Hesperoperla.

https://bugguide.net/node/view/1257709

I'm leaning more towards Calineuria.
https://www.zoology.ubc.ca/~biodiv/entomology/main/Plecoptera/Perlidae/Calineuria%20californica%20(1dorsal).jpg

And here's a view of Hesperoperla's wings.

https:/bugguide.net/node/view/41324/bgimage

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Male Calineuria californica (Golden Stone) Stonefly Adult Pictures

Collection details
Location: South Fork Snoqualmie River, Washington
Date: July 20th, 2019
Added to site: July 22nd, 2019
Author: Troutnut
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