Invitational Lecture.- Applied Aspects of Mayfly Biology.- Phylogeny and Systematics.- Permian Mayfly Nymphs: New Taxa and Systematic Characters.- Phylogeny of the Leptophlebiidae (Ephemeroptera): An Introduction.- Phylogenetic Relationships and Zoogeography of Cool-Adapted Leptophlebiidae (Ephemeroptera).- Phylogenetic Relationships of the Leptophlebiidae of New Zealand (Ephemeroptera).- Geographic Distribution and Reclassification of the Sub-Family Ephemerellinae (Ephemeroptera, Ephemerellidae).- A Review of the Nearctic Heptagenia (Heptageniidae, Ephemeroptera).- Jubabaetis gen.n. and Platybaetis gen.n., Two New Genera of the Family Baetidae from the Oriental Region.- Un Changement dans la Taxonomie de la Famille Baetidae.- Faunistics.- The Habitats of British Ephemeroptera.- La Zoogeographie, lEcologie et la Protection des Eph?m?ropt?res en Pologne, et leur Utilisation en tant quIndicateurs de la Puret? des Eaux Courantes.- The Distribution of Ephemeroptera in Northern Canada.- The Occurrence and Biology of Siphlonisca aerodromia Needham (Ephemeroptera: Siphlonuridae) in Maine, U.S.A. (Abstract).- Abundance and Altitudinal Distribution of Ephemeroptera in a Rocky Mountain Stream.- Biology and Ecology.- Mayfly Strategies in a Norwegian Lake.- Some Aspects of the Biology of Ephemera danica M?ll. (Ephemeridae, Ephemeroptera) in Irish waters.- Regime Alimentaire des Larves de Deux Genres dEph?m?ropt?res: Raptobaetopus M?ller-Liebenau, 1978 et Prosopistoma Lattreille, 1833.- Life History, Developmental Processes and Energetics of the Burrowing Mayfly Dolania americana.- The Nutritional Dynamics of the Burrowing Mayfly, Hexagenia limbata.- Overwintering Strategy of Cloeon dipterum L. Larvae.- Stages and Physiological Periods in the Development of Cloeon dipterum L. (Baetidae).- Behaviour.- Predation, Climate and Mating of Mayflies.- Diel Emergence Patterns of Some Mayflies (Ephemeroptera) of the Roseau River (Manitoba, Canada).- Diurnal Variation in the Activity ofl#+