It is proposed to offer a series of papers, based primarily on the material collected by Professor E. H. Strickland of the University of Alberta at Edmonton.

Chelynia nitida (Cresson). This genus of parasitic bees has over twenty species in North America, the majority from the Pacific Coast region. There are two closely allied species described from females, black with cream-coloured abdominal bands. For some years I have had in my collection a male from Tolland, Colorado, July 1915, at flowers of Frasera, collected by L. A. Kenoyer, determined by me as C. nitida (Cress). I now receive a very similar but distinct male from Professor E. H. Strickland, collected by O. Peck at Beaverlodge, Alberta, July 6, 1931. I conclude that this must be the genuine C. nitida, and the Tolland one the undescribed male of the related C. idahoensis Swenk.