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The 4th part concerning the bees of Switzerland treats the genus Anthidum, Chelostoma, Coelioxys, Dioxys, Heriades, Lithurgus, Megachile, Osmia and Stelis. Discusses distribution, season of flight, biology, and if present, parasitic bees with their host species. Typical features include a determination key, and a short classification for each genus in German and French.