In addition to being critical components of terrestrial ecosystems, insects provide excellent model systems for understanding evolutionary ecology. This book is developed from proceedings of the Royal Entomological Society's 22nd international symposium, held in Reading in 2003. Topics include speciation and adaptation; life history, phenotype plasticity and genetics; sexual selection and reproductive biology; insect-plant interactions; insect-natural enemy interactions; and social insects. This book will be of significant interest to reserearchers in entomology, ecology, and evolution.