This book is a comprehensive guide to the bumble bees of North America. The book provides detailed information on the identification, distribution, ecology, and conservation of all 46 bumble bee species found north of Mexico. The book is richly illustrated with color photographs, diagrams, range maps, and graphs of seasonal activity patterns, and includes illustrated keys that allow identification of color morphs and social castes. The book is a standard reference for naturalists, conservationists, and researchers.