The Crackleback, originated by Ed Story of Feather-Craft in St. Louis, has been around for 50 years or so. In their catalog, they call it a "F-C Crackleback Dry Woolley." They also sell a beadhead version which is obviously a wet fly, but you can fish the dry version wet as well, casting it down and across, letting it swing, then skipping or stripping it back. I tie it in about a half dozen body colors from size 8-20 and have found it to be one of my most productive flies, for a variety of species.