The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
The males have these abbreviated wings. I doubt they can fly but they can run faster than any stonefly I have seen. The also have an interesting habit of jumping.
This stonefly was collected from the Touchet River in Washington on August 3rd, 2011 and added to Troutnut.com by Bnewell on August 3rd, 2011.