The chrysomelids include a number of species of popular interest, either because of their attractive metallic coloration or status as pests in farms and gardens. Keys to the Adults of Seed and Leaf Beetles covers the adults of the Chrysomelidae (277 species including the Bruchinae, previously considered a family rather than subfamily), Orsodacnidae (2 species, previously placed in the Chrysomelidae) and Megalopodidae (3 species, also previously in the Chrysomelidae). Illustrated keys to subfamilies and small families, genera and species are provided. Like all AIDGAP keys it has been extensively tested and refined during its development.