The preceding part under this general title was published in 1940 (Can. Ent., 72:151-155). The new species described at this time were collected by Messrs. A. E. Brower, R. E. Nye, G. F. Knowlton and H. D. Pratt, and by Dr. Marion E. Smith. I am very greatly indebted to all of the above for the privilege of retaining the type specimens in my extensive collection of these flies.