In a recent contribution in this Journal, I described a few new Diptera from Canada. The present paper contains descriptions of six new Canadian species and two from the United States, the types of the Canadian species being in the Canadian National Collection. The descriptions of two of the species of Ptiolina in this paper have been prepared by Dr. M. D. Leonard and are included in order that the key to species may be complete. From our study of this genus it seems probable that there are other species to be found, especially in the north where so little collecting has been done.