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Artistic view of a Male Pteronarcys californica (Pteronarcyidae) (Giant Salmonfly) Stonefly Adult from the Gallatin River in Montana
Pteronarcys californica

The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.

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.
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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Wiflyfisher has attached this picture to aid in identification. The message is below.
Western Caddisfly adult
Wiflyfisher's profile picture

Posts: 622
Wiflyfisher on Jul 23, 2007July 23rd, 2007, 3:06 pm EDT
The caddisfly in the photo produced a heavy hatch and egg laying on the Henry's Fork River in the riffled water areas. It also appeared to put sticky yellow blobs of eggs all over our waders too!

Any thoughts on what this is?
Site Editor
"Bear Swamp," PA

Posts: 1681
GONZO on Jul 23, 2007July 23rd, 2007, 3:40 pm EDT
John, this isn't a hydroptilid; they are very small (under 5mm) and very hairy. It's a hydropsychid, but maybe one of the experts will have a better idea about species.
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Site Editor
Plano, TX

Posts: 1311
Taxon on Jul 23, 2007July 23rd, 2007, 6:27 pm EDT
I believe it to be a Spotted Sedge (Hydropsyche), likely H. occidentalis, if you encounteded a heavy emergence of them on the Henry's Fork.
Best regards,
Roger Rohrbeck
Wiflyfisher's profile picture

Posts: 622
Wiflyfisher on Jul 24, 2007July 24th, 2007, 1:22 am EDT
Yes, there was at times a heavy emergence of these caddis on the Fork.

Thank you!

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