The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
Here is the female spinner of the tiny Acentrella turbida. You can see the coloration is quite different from the male.
This mayfly was collected from the Touchet River in Washington on July 27th, 2011 and added to Troutnut.com by Bnewell on July 29th, 2011.