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Salmonflies
Pteronarcys californica

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

Stenonema vicarium (March Brown) Mayfly Nymph Pictures

I photographed this Maccaffertium vicarium nymph shortly after it molted to a new instar in my holding container. Many nymphs take on drastically different coloration immediately after molting, and this species is no exception.

This mayfly was collected from the Beaverkill River in New York on April 19th, 2006 and added to Troutnut.com by Troutnut on April 21st, 2006.

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