I have been using "Deer Fly" and "Horse Fly" patterns for fly fishing for warm water fish (sunfish & crappies), I will add the "House Fly" pattern to my terrestrial fly box, and most likely modify my other two fly patterns. I know the fish go for the "Deer Fly" and "Horse Fly" patterns, I am sure they will go for the "House Fly" pattern as well! ~Parnelli