The Caddis Emerger was developed by Mike Lawson of Blue Ribbon Flies in Yellowstone, Montana and is used throughout the West. Mike was born and raised near Henry's Fork and fished the spring creek his whole life. Emergers are an important fly pattern for these types of waters. The fly consists of a Z-lon trailing shuck in which the material is brought over the tope of the abdomen body and utilized as an underwing. Lawson recommends antron dubbing for the body, although others have used many other materials. A peacock herl represents the thorax and provides floatation within the surface film.
Mike wrote an important book, Spring Creeks (2003), and commented: "There are a number of effective caddis cripple and stillborn patterns. Utilizing the concepts of the LaFontaine Emergent Sparkle Pupa, I developed the Partridge Caddis Emerger to imitate the pupa that is trapped in the surface film. The body is tied with sparse, rough Antron with a trailing shuck; the wing is an underwing of sparse Antron and an overwing of mottled partridge or grouse hackle. The wing should be tied very short, not more than the length of the hook shank."