This book presents biosystematic information on fruit flies of the world that are of economic importance, and includes host data for about 250 species, as well as illustrated keys to adults, distribution data and recent references for over 100 of these species. In addition there is extensive coverage of larval stages, with the inclusion of keys separating the final instar larvae of over 60 species and detailed new descriptions of 34 of these species. As a whole, the book is a comprehensive identification guide to fruit fly pests across many temperate regions and will be invaluable to entomologists and pest control specialists.