Griffiths Gnat
After adults penetrate the surface film. I imitate the adult with the Griffiths Gnat, The brain child of George A. Griffith.
Mr Griffiths tied the fly on a size 20 hook with a peacock body palmered with grizzly hackle.
He introduced the fly to Dr Ernest Schwiebert who popularized the fly in his classic book “Nymphs.”
Schweirbert told me the Trout took the Gnat for a cluster of resting or mating diptera on the surface film.
Dr Schwiebert varyied the body material, sometimes substituting muskrat or floss for peacock.
Anytime I can incorporate peacock into a Spring Creek pattern I do, so I sick with the peacock body. I tie it in sizes 18 to 28. The most common size is #18.
Mr Griffiths pattern is my “go to” pattern when adult diptera are on the water.