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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Re: UV spectrum and trout
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Mayfly Genus Pseudocloeon (Tiny Blue-Winged Olives)

Taxonomic History

All North American species previously assigned to the genus Pseudocloeon have been moved to other genera. However, the genus is mentioned so often in angling books that I'm keeping a page online for it as a reference to where these species were moved:

Pseudocloeon anoka = Iswaeon anoka
Pseudocloeon carolina = Acentrella turbida
Pseudocloeon dubium = Plauditus dubius
Pseudocloeon edmundsi = Iswaeon anoka
Pseudocloeon futile = Apobaetis futilis
Pseudocloeon propinquum = Labiobaetis propinquus
Pseudocloeon punctiventris = Plauditus punctiventris
Pseudocloeon turbidum = Acentrella turbida

Several other less well-known species were also moved to Labiobaetis.