The Griffiths Gnat is the brain child.of George A Griffiths.
Mr Griffiths tied the fly with a peacock body palmered with grizzly hackle.
Griffiths introduced the fly to Dr Ernest Schwiebert who popularized the fly in his classic book “Nympha.”
Schweirbert told me he thought the Trout took the Gnat for a cluster of resting or mating diptera on the surface film.
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.
Mr Griffiths pattern is my “go to” pattern when adult diptera are on the water.