The Epoxyback Emerger imitates a dry emerging mayfly. Tied in all the common species, the front simulates the emerging wing while the back is tied to match the splitting nymph shuck as the adult emerges from the nymph.
Good cripple imitation too. This fly also has a foam emerging wing to aid in floatation.
This fly is meant to be a dry fly, but sits very low in the water like a true emerger. Comes in BWO, PMD, Callibaetis, and even Green Drake.