The present paper is an attempt to review and bring up to date our knowledge of the Canadian species of net-winged Midges or Blephariceridae. Since the publication in 1903 of Kellogg's “Net-Winged Midges of North America,” several new species have been added to our list and additional records have come to hand thus increasing our knowledge of the distribution of several species; also certain generic changes seem advisable and it is hoped that the present paper will serve to facilitate the identification of our Canadian species.