Hex Mayflies
Hexagenia limbata
The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.
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This specimen keys to the Epeorus albertae group of species. Of the five species in that group, the two known in Washington state are Epeorus albertae and Epeorus dulciana. Of the two, albertae has been collected in vastly more locations in Washington than dulciana, suggesting it is far more common. On that basis alone I'm tentatively putting this nymph in albertae, with the large caveat that there's no real information to rule out dulciana.
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Stonefly Genus Neoperla (Golden Stones)
Genus Range
Identification
To determine whether a specimen of Perlidae belongs to Neoperla, use the Key to Genera of Perlidae Nymphs.
Start a Discussion of Neoperla
Stonefly Genus Neoperla (Golden Stones)
Taxonomy
Species in Neoperla: Neoperla coosa, Neoperla stewarti
13 species (Neoperla carlsoni, Neoperla catharae, Neoperla choctaw, Neoperla clymene, Neoperla coxi, Neoperla falayah, Neoperla gaufini, Neoperla harpi, Neoperla harrisi, Neoperla mainensis, Neoperla occipitalis, Neoperla osage, and Neoperla robisoni) aren't included.