Recent examination of a large number of Rhyacophilidae has resulted in the establishment of some very interesting distributional records as well as the recognition of several new species. New species, descriptions of hitherto unassociated females or little known species, and new distributional records in the Rhyacophila, Glossosoma, Anagapetus, Agapetus, and Atopsyche are discussed in this paper I would like to take this opportunity to thank Dr. L. J. Milne of the University of Vermont for the generous loan of his Rhyacophila holotypes, fourteen of which are figured and briefly described herein. Material from the University of Massachusetts is designated as (Mass.), from the University of Minnesota as (Minn.), from the American Museum of Natural History as (AMNH), from the North Carolina Department of Agriculture as (NC) and from the California Academy of Sciences as (Cal.). Unless designated otherwise types are in the writer's collection at the University of Wyoming.