In terms of "power bugs" the baetis has to be near the top of the list, doesn't it? You can fish blue-winged olives from coast to coast, in spring or fall, and sometimes in between. Midges comprise the bulk of any trout's diet, so they are certainly critical bugs. But I just never liked fishing tiny bugs on the surface--at least not as much as I like fishing big mayflies. Which leads me to the Hexagenia. When those things fall on the river, it is unreal. Problem is this usually happens in the middle of the night, so it's hard to actually see it happening.