An introduction to all aspects of modern entomology, this text provides the student with a basic understanding of insect structure, function, development, classification and phylogeny. Chapters have been revised in this edition to take account of developments such as pheromones, thermoregulation and views on cladistics. The book also introduces readers to the ways in which insects exemplify many phenomena of general biological interest. All major insect modes of life are discussed, including the relations of insects to plants and micro-organisms, their role as predators and parasitoids, and their adaptations to aquatic and social lifestyles. In a chapter new to this edition, the biology of insect populations is considered in some detail, with special emphasis on quantitative aspects of population dynamics and predator-prey interactions, together with related subjects such as competition density regulation and the stability, diversity and succession of insect populations. The book is suitable for undergraduate students of entomology and other biological science courses, such as zoology, agriculture and horticulture.