BH Emerger(TM) - Black, Blue Wing Olive (BWO), Little Stone, March Brown, Pale Morning Dun (PMD), Sally, Quill. The BH Emerger - Sally is a great Little Stonefly nymph. Used at or near the hatch, this fly is very effective. Designed by *Mark Boname the Bead Head Split Foam Emerger Series(TM) is our best emerger patterns. With incredible detail for such small patterns, these are our most successful midge nymph patterns.