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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Drunella flavilinea (Flav) Mayfly Nymph Pictures

Although the identification is not certain because the nymph is not yet mature, the configuration of tubercles on this one--particularly the forefemora--seems to best match Drunella flavilinea.