Your mayfly is an unusually dark male Stenacron spinner (Heptageniidae). The primary tip-off to its identity is the dark mark connecting cross veins in the forward portion of the forewing. This is one of the many genera/species sometimes called Light Cahills by fly fishers. The female spinners are sometimes called Salmon Spinners because of the bright pinkish-orange color of their abdomens (caused by underlying egg masses).
Oldredbarn on Jun 5, 2010June 5th, 2010, 2:33 pm EDT
[do u no any sites with a guide to the flies]
Your on it big fella...Just go and check out the insect section and Jason's wonderful photos of bugs...If only we had photo's like these when we started years ago...They blow the color plate section of Justin Leonards "Mayflies of Michigan Trout Streams" to shreads, but they were wonderful pre the new technology.
Once you check them out and have some serious questions just ask Gonzo or Taxon and they will explain it all to you...
"Even when my best efforts fail it's a satisfying challenge, and that, after all, is the essence of fly fishing." -Chauncy Lively
"Envy not the man who lives beside the river, but the man the river flows through." Joseph T Heywood