Notes on the “Borrowed” Specimens and Names for Charles de Geer's Darkling Beetles (Insecta: Coleoptera: Tenebrionidae)

The status of 23 species-group names used by Charles De Geer, for beetles classified in PyrochroaGeoffroy, 1762, and TenebrioLinnaeus, 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 bimaculatus (Linnaeus, 1760); Tenebrio acuminatus De Geer, 1775 = Blaps mortisaga (Linnaeus, 1758); Tenebrio variolosus De Geer, 1775 = Upis ceramboides (Linnaeus, 1758); Tenebrio molitor De Geer, 1775 = Tenebio molitorLinnaeus, 1758; Tenebrio rugosus De Geer, 1775 = Opatrum sabulosum (Linnaeus, 1760); Tenebrio villosus De Geer, 1775 = Lagria hirta (Linnaeus, 1758); Tenebrio hirticornis De Geer, 1775 = Orthocerus clavicornis (Linnaeus, 1758); Tenebrio boleti De Geer, 1775 = Diaperis boleti (Linnaeus, 1758); Tenebrio gibbus De Geer, 1775 = Psammodes gibbus (Linnaeus, 1761); Tenebrio maurus De Geer, 1775 = Tenebrioides mauritanicus (Linnaeus, 1758); Tenebrio aeneus De Geer, 1775 = Tenebrio chalybeusLinnaeus, 1767, a misidentification of Xylopinus saperdiodes (Olivier, 1775); and Tenebrio surinamensis De Geer, 1775 = Oryzaephilius surinamensis (Linnaeus, 1758). The holotype of Pyrochroa tomentosaDe Geer, 1775, and specimens described under the name Tenebrio maurus, De Geer, 1775, from the De Geer Collection were rediscovered within the Paykull Collection, Swedish Natural History Museum. Pyrochroa nigraDe Geer, 1775, is a junior synonym of Prionychus ater (Fabricius, 1775); a recently reported synonymy with Schizotus pectinicornis (Linnaeus, 1758), is an error. The holotypes of Pyrochroa nitidaDe Geer, 1775, and Tenebrio lardariusDe Geer, 1775, are considered lost. Tenebrio gibbusDe Geer, 1778, a junior primary homonym of Tenebrio gibbusLinnaeus, 1760, has the replacement name Tenebrio striatusRetzius, 1783, and is a synonym of Zophosis reticulatusSay, 1824, syn. nov., making the valid combination of this North American species Discodemus striatus (Retzius, 1783), comb. nov.