DR. K.G. ADIYODI, formerly Professor of Physiology and Dean, Faculty of Science, Calicut University, Kerala, India and Vice-Chancellor, Cochin University of Science and Technology, Kochi, is now Public Service Commissioner to Government of India, New Delhi. A distinguished invertebrate reproductive biologist, who gave the discipline of invertebrate reproductive biology a global distinctiveness and identity of its own, Dr. K.G. Adiyodi is Founder Secretary of the International Society of Inverebrate Reproduction, Founder Editor-in-Chief of the International Journal of Invertebrate Reproduction and Development, and Founder President of the Indian Society of Invertebrate Reproduction. DR. RITA G. ADIYODI, formerly Rhodes Visiting Fellow, Somerville College, Oxford (1976-78), is Professor of Zoology at Calicut University. She served as President of the Crustacean Reprobiology and Aquaculture Bureau of India and as Vice-President of the Indian Society of Invertebrate Reproduction. Dr. Rita Adiyodi represented India on the International Committee of Comparative Endocrinology. The Adiyodis have worked extensively, over the past three decades, on the endocrinology and physiology of growth and reproduction of arthropods, chiefly crustaceans. DR. AUGUST DORN is Professor of Zoology at the Institute of Zoology, Johannes Gutenberg-University (JOGU) in Mainz, Germany. After his doctoral degree from the JOGU, he carried out a research project at the Albert Einstein College of Medicine in New York: Neuroendocrine Processes in Insect Embryos. Since 1972 he is professor at the JOGU and teaches General and Applied Endocrinology. His chief research interests are Endocrine Regulation of Insect Reproduction, Role of Hormones in Locust Phase Polymorphism and Mode of Action of Natural Insect Growth Regulators. In 1981/82 he was Visting Professor at the Department of Biology at the University of North Carolina in Chapel Hill (USA) sponsored by the VW-Stiftung. He has published numerous articles in the above-mentioned fields.