Salmonflies
Pteronarcys californica

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

Stream photos

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In the Mayfly Genus Tricorythodes by Bwoklink (Martinlf replied)

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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.

Caudatella hystrix Mayfly Nymph Pictures

This is a widely distributed species in western Montana but never abundant. Note the length of the middle tail, a key to the identification of this genus.