The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
Before I reared this specimen the nymphs were unknown. See Western North American Naturalist for the paper on the description of this species' nymph.
This mayfly was collected from the Big Thompson River in Montana on April 4th, 2007 and added to Troutnut.com by Bnewell on June 26th, 2011.