The occurrence of insects and other arthropods of medical importance in Europe (excluding the European USSR) is summarized on the basis of a compilation of almost all available references in the scientific literature. The report includes, for each major group of arthropods, a listing of species and subspecies with biological and distributional data, tabulations of diseases or disease organisms transmitted, and complete literature citations. The groups of arthropods included, with the number of species or subspecies in parentheses, are: Mosquitoes (363), Black flies (206), Sand flies (42), Midges (115), Horse flies (379), Biting flies (5), Non-biting flies (38), Fleas (330), Bugs (9), Urticating and vesicating arthropods (4), Ticks (159), Mites (34), and Miscellaneous arthropods (20). (Author).