The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
This nymph was one of many I collected with vivid white or semi-transparent markings on the front of the head, the sides of the pronotum, and the last abdominal segments.
This mayfly was collected from the Gulkana River in Alaska on July 17th, 2011 and added to Troutnut.com by Troutnut on July 20th, 2011.