Male. Closely allied to difformis Sm., especially to the paler colored forms of this variable species. Antennae strongly serrate and fasciculate as in difformis. Thoracic vestiture rather rough, composed of scales and hair, light smoky gray. Primaries pale smoky, with a slightly grayer tinge than is usually found in difformis. Maculation similar to that of difformis but scarcely as distinct, the crosslines being less contrastingly dark and the spots less distinctly outlined. The main difference occurs in the secondaries which are entirely pearly white with no traces of the postmedian line and subterminal smoky shade found in difformis. Expanse 30 mm.

During the past twenty-five years, the writer has made spasmodic collections of Ichneumonoidea in various parts of Alberta, although, in the earlier years, prospects for getting them authoritatively determined were somewhat remote. In addition, smaller collections, chiefly one made by Dr. G. Salt and determined by Mr. R. A. Cushman in 1927, duplicate specimens taken by Dr. R. Salt in later surveys of insects associated with alfalfa, and specimens taken by a few university students, have been donated to the university collection.