This may come across as a ridiculous question to those that have been around fly fishing for a long time, but what exactly is a Catskill Dry fly? I recently joined the beginners swap and on the shcedule for flies to tie are classic dry patterns that "don't have to be Catskill dries." This has really gotten a hold of my curiosity and is driving me nuts. I've tried looking at flies that I've heard refered to as Catskill Dries, such as the Light Cahill and the Coffin Fly, but all I seem to be able to gather from this is that they are all tied with fairly narrow bodies, upright wings, and sparse hackle. Am I on the right track here, or is there a formal definition that I haven't been able to figure out? Any help would be greatly appreciated, because right now I'm completely stumped.