The quill emerger is very effective when used during insect hatches. The fly is tied on either a size 12 or 14 hook and can be tied in the light brown color, or olive. I have used this fly during Sulphur hatches with success and the olive ones can be used during BWO hatches. The fly sits just under the surface but if you grease the leader it will sit up in the meniscus. You can also slowly strip it thru the water to mimic a bug moving under the water.