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.
Redacted on Feb 14, 2011February 14th, 2011, 7:49 pm EST
Guys, Sorry. For some reason I'm having a heck of a time posting the photo of the bug for you to ID. Didn't mean to post the first one without a photo and certainly didn't want to post the blank above. Rats.
Anyway, if you want to view the insect get on TroutUnderground.com and search for the post about Bitterroot Skwallas and what I've been calling Ameletus mays. It appeared last Spring. Got a nice picture of a dun on a cork handle that should provide enough diagnostic clues.