Salmonflies
Pteronarcys californica
The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
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This species was fairly abundant in a February sample of the upper Yakima.
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Isoperla (Stripetails and Yellow Stones) Stonefly Nymph Pictures
This is probably Isoperla petersoni, a very common Perlodid stonely in Alaska streams.
This stonefly was collected from the Kwethluk River in Alaska on July 9th, 2010 and added to Troutnut.com by Bnewell on July 3rd, 2011.