The papers included in this volume were amongst day running of the conference, and Ms Julia those presented at the 5th International Epheme­ Reed, Ms Kim James, Ms Anne Devereaux, roptera Conference and the 9th International Mr Peter Green, Ms Catriona Smith who assist­ Plecoptera Conference at the Marysville Hotel, ed them, Mr David Ginn and all the staff at the Marysville Australia from the 18th to the 24th of Marysville Hotel also deserve special thanks for February 1987. The conference was attended by the the superb catering and relaxed atmosphere 62 participants from 21 countries. This was the they created which contributed so much to the frrst time the two conferences had been held conference. together, and the frrst time either had been held in All the papers included in this volume were the southern hemisphere. refereed prior to acceptance, and I would like to The papers included here cover a broad spectrum thank the following referees: Dr J. Davis, of research into the two orders of aquatic insects, Dr L. Barmuta, Dr R. Marchant, Mr T. Doeg, with the emphasis on life histories, which was the Dr P. Bailey, Dr S. Bunn, Dr R. Rowe, Dr R. theme of a joint symposium held during the con­ Pearson, Ms C. Yule and Dr P. Suter. Ms Sue ference. The paper by Dr Brittain was presented Mitchell assisted with the typing and Ms Kerrle as a keynote address to that symposium. The Swadling with the proof-reading of the text.

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Life History Strategies in Ephemeroptera and Plecoptera.- Life Cycles and Ecology of Some Species of Ephemeroptera from Spain.- A Flexible Larval Development Strategy in Siphlonurus Aestivalis Eaton Exploiting an Unstable Biotope.- The Biological Cycle of Baetis Pentaphlebodes, Ujhelyi 1966, in an Old Meander of the Rhone River, France (Ephemeroptera: Baetidae).- Relationships Between Habitat Dynamics Food Availability, and Growth Patterns Of Ephemerellid Mayflies from Western North America.- Life Cycles of Some Species of Plecoptera in Sierra Nevada (South of Spain).- Ephemeroptera Emergence from a High Mountain Stream in Tyrol, Austria.- Timing and Synchronicity of the Emergence of Ephemera Strigata.- The Life Cycle and Dietary Habits of Illiesoperla Mayi Perkins (Plecoptera: Gripopterygidae) in Victoria, Australia.- Life Histories of Some Ephemeroptera from Victoria, Australia.- Post-Oviposition Development of Eggs of South Australian Mayflies.- Oogenesis and Involvement of Chorionic Structures in Ephem-Eropteran Taxonomy.- Respiratory Rate of Mayfly Nymphs in Water with Differing Oxygen and Ionic Concentrations.- Respiratory Functions of Motile Tracheal Gills in Ephemeroptera Nymphs, as Exemplified by Siphlonurus Occidentals Eaton.- Can Adult Stoneflies Utilize What They EAT?.- Ephemeroptera of the Fiji Islands.- Distribution of Stoneflies in New Zealand.- Transantarctic Relationships in the Plecoptera.- The Australian Mayfly Fauna: Composition, Distribution and Con-Vergance.- Distribution Patterns of North and Central American Mayflies (Ephemeroptera).- The Distribution of Southwest North American Mayfly Genera (Ephemeroptera) in the Mexican Transition Zone.- Distribution of Plecoptera in the Tama-Gawa River System, Central Japan.- Stoneflies (Plecoptera) of South Australia.- Abundance, Altitudinal Distribution and Swarming of Ephemeroptera in Palni Hills, South India.- Ephemeroptera of the Gunnison River, Colorado, U.S.A..- Determinants of the Distribution and Abundance of Larval Ephemeroptera (Insecta) in Hong Kong Running Waters.- The Relationship between Some Physical Factors and Mayflies Emerging from South Duck River and Cowan Creek, Manitoba.- Recurrence of Hexagenia Mayflies Demonstrates Improved Water Quality in Pool and Lake Pepin, Upper Mississippi River.- Detritivorous Stoneflies of an Iron-Rich Stream: Food and Feeding.- Benthic and Hyporheic Faunas of Mayflies and Stoneflies in the Ter Tiver Basin (Ne-Spain).- Intraspecific Variation and Information Content of Drumming in Three Plecoptera Species.- Patch-Specific Variation in Drift Density of Baetis.- Some Aspects of the Ecology of Leptophlebia Vespertina (L.) (Ephemeroptera: Leptophlebiidae).- Prediction of Changes in Ephemeropteran Communities - A Transition Matrix Approach.- The Mayfly-Mussel Association, a New Example from the River Niger Basin.- Neoperla Clymene Revisited: Systematics of the Nearctic Species Complexes (Plecoptera: Perlidae).- The Nymph and Male of Centroptiluminfrequens MCD (Baetidae).- Siphlonurus Ireneae SP. N. from Spain (Ephemeroptera: Siphlo-Nuridae).- A New Genus and Species of Leptophlebiidae: Atalophlebiinae from the Celebes (Sulawesi) (Ephemeroptera).- A Note on the Nymphs of the Genus Notoperla Enderlein 1909 (Plecoptera, Gripopterygidae, Leptoperlinae).- Colonization of a Parthenogenetic Mayfly (Caenidae: Ephemeroptera) from Central Africa.- Size Variation in Kempnyia (Plecoptera: Perlidae).- Intersexuality and Homeotic Manifestation of Secondary Sexual Characters in Baetodes (Ephemeroptera: Baetidae: Baetinae).- Morphological Variability of Tyrrhenoleuctra Minuta (Klapalek, 1903) in South-Spain.