This pattern is tied on a size 14 hook and can cover a range of nymphs of upwinged flies.  Hackle tail, slim grey body, hackle legs and an epoxy wing case complete this simple but effective fly.  Fish this unweighted pattern using a floating line and a long leader.  The fly should fish in the top six inches of water, the dark wing case suggesting an insect that is about to hatch.  Line retrieve should be just enough to keep in touch with the fly and the takes on this pattern can be very subtle.  This fly can be used on rivers and lakes and can be productive all season although it’s peak time would be in the spring.