This summer below the BSD and Norfork Dam I noticed trout that appeared to be midging. But on closer inspection of the water, I found thousands of tiny white flies drifting by on the surface. They were way too small to be a trico, and didn't look like any midge picture that I can find on the net. They had 4 wings that were almost perfectly round and lay flat on the water. These things were tiny, like a size 30 if such a size even exists, but the fish were gobling them up. On both occasions, I put on a size 24 cream dry, which was way bigger than the naturals, and did pretty well. Anyone have any idea what they are? I'm kinda new to this, but they sure didn't look like a midge to me.