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

Posts: 437
Lastchance on Feb 18, 2008February 18th, 2008, 9:49 am EST
Can anyone recommend light and dark Cahill nymph patterns for Western PA. I'm kind of lost on these nymphs. Are they a brownish-olive color? I guess it depends on stream bottom coloration. I know they are part of the same family as the March Brown. Would they be tied in sizes 12 & 14 2x? Any help will be appreciated.
Troutnut
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Administrator
Bellevue, WA

Posts: 2758
Troutnut on Feb 18, 2008February 18th, 2008, 11:43 am EST
There are about a million mayfly species known as light or dark cahills, and there's quite a bit of variety in their nymphs. The more specific you can get about the exact hatches you want to match, the better -- rivers, time of year, size/color of adults, etc. Quite a few people here have enough local PA knowledge they might be able to help you, but just going by PA cahills isn't enough.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
JAD
JAD's profile picture
Alexandria Pa

Posts: 362
JAD on Feb 18, 2008February 18th, 2008, 11:56 am EST
Lastchance February 18th, 2008, 5:49 pm
Portage, PA

Posts: 4 Can anyone recommend light and dark Cahill nymph patterns for Western PA. I'm kind of lost on these nymphs. Are they a brownish-olive color? I guess it depends on stream bottom coloration. I know they are part of the same family as the March Brown. Would they be tied in sizes 12 & 14 2x? Any help will be appreciated.
Replies:

Portage PA

HI Lastchance
I fish the same general area your located. I tie mine like a PT with a cream thorax and a dark wing case. 14 or 16 should do it. Sometimes I do well on a emerger, same general pattern with antron (Deer hair) short wing.

John


They fasten red (crimson red) wool around a hook, and fix onto the wool two feathers which grow under a cock’s wattles, and which in colour are like wax.
Radcliffe's Fishing from the Earliest Times,

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