This is a fly pattern that a friend of mine found in an old American Angler magazine that talks about spring fishing in the driftless area of southwest Wisconsin. Last spring we tied some up and put it to the test and had very positive results. I caught most of my fish on this fly including a beautiful 17 inch brown. I haven’t had much of a chance to test it elsewhere, but I’m sure it would work wherever there are small mayflies and midges.