Comprehensive checklist with species description covering more than 3,800 family-, genus-, and species-group taxa, providing a much-needed foundation for research into these insects' systematics and biology. Presents an overview of hawkmoth morphology and biology, including a discussion of the moths' immature stages, their roles as pollinators and as pests, and their importance in conservation issues. The authors then propose a new system for higher classifications of hawkmoths, one based on the results of the most recent phylogenetic research.