Following the first Conference in Florida, U.S.A. (1970) and the second in Krakow, Poland (1975), the Third International Conference on Ephemeroptera was held in Hinnipeg, Manitoba, Canada from the fourth to the tenth of July, 1979, at the invitation of the Inter national Permanent Comraittee on Ephemeroptera. (H.L. Peters, U.S.A. (Chairman); I. Uu11er-Liebenau, Jest Germany; H.J. Schoonbee, South Africa; G.F. Edmunds, Jr., U.S.A.; E.F. Riek, Australia; R. Sowa, Poland). The Conference -laS hosted by the Freshwater Institute (Department of Fisheries and Oceans, Canada) and the University of...