The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.
This specimen resembled several others of around the same size and perhaps the same species, which were pretty common in my February sample from the upper Yakima. Unfortunately, I misplaced the specimen before I could get it under a microscope for a definitive ID.
Kenlindblom on Jul 26, 2013July 26th, 2013, 5:24 pm EDT
I have seen Isos with the forward edge of their wings an olive color. These were also on the upper East Branch. I tied some using a permanent marker to tint the leading edges olive. But, it seems that the standard pattern works as well.
Welcome aboard, Ken. Isonychia seem to come in a wide variety of wing colors. Sounds like the ones you observed on the upper East Branch may have looked something like this:
Incidentally, you might want to update your profile with location info so folks aren't forced to guess what part of the world you are from.