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The status of 23 species-group names used by Charles De Geer, for beetles classified in Pyrochroa Geoffroy, 1762, and Tenebrio Linnaeus, 1758, is assessed. Thirteen of these species-group names are unavailable (ten were published in synonymy, three are subsequent usages of available names): Pyrochroa rubra De Geer, 1775 = Pyrochroa coccinea (Linnaeus, 1760); Pyrochroa bimaculata De Geer, 1775 = Apalus...