This guide is the first volume of a series on Hymenoptera of Europe. In its first part, a general presentation is given on their morphology, ecology, evolution and methods for establishing a collection of specimens. The authors also propose a key for the identification of all superfamilies recorded on the European continent. The book deals with the biology, morphology, ecology and conservation of European wild bees. It offers the first illustrated identification key for the 77 genera, as well as an exhaustive inventory of species and a complete description of representative examples of wild bees within each genus, taking into account the latest scientific advances.