The coffin fly will represent a variety of light colored mayflies. If there is a light colored mayfly species hatching on the river, there is a good chance they’ll eat this fly pattern. The spent wing coffin fly shown here is such an amazingly versatile spent wing mayfly pattern that you would be doing yourself a disservice by not owning any. I have used this fly with great success during sulphur hatches, hendrickson hatches and many others. This is also a great green drake spinner pattern that might just knock your socks off.
Perhaps the best feature of this fly is now nicely you can color it with a permanent marker to simulate just about any colored fly. Heck, you could fill a fly box with just this fly, bring a set of various colored markers and just about be able to catch fish all year long with only one pattern.