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In this paper, five names used for darkling beetles (Insecta: Coleoptera: Tenebrionidae) in the Linnaeus collection at the Museum of Zoology, Uppsala University (UUMZ) are evaluated based on specimen examinations, modern species concepts, and review of the original species diagnoses. The types are of species described in Systema Naturae (Tenebrio caraboides L., 1758, Tenebrio gibbus L., 1760, Tenebrio gigas L., 1767, and Tenebrio muricatus L., 1758) and Museum Ludovicae Ulrica (Tenebrio spinosus L., 1764). Tenebrio caraboides L., 1758, refers to a composite type series consisting of two UUMZ paralectotypes, identified herein as Pachychila hispanica Solier, 1835, and gaditana Rosenhauer, 1856, and the lectotype in the Linnean Collection, Natural History Museum, London (BMNH), for the ground beetle Cychrus caraboides (L. 1758). The three specimens in the De Geer Collection, Swedish Museum of Natural History, Stockholm (NHRS), under Tenebrio gibbus L., 1760, are determined as Psammodes gibbus (L., 1760), comb. nov.; this includes the "lost" type of Linnaeus, whereas the UUMZ Linnaeus specimen is not a type and identified as an undetermined species of Amnodeis Miller, 1858, similar to A. giganteus Reiche & Saulcy, 1857. The type of Tenebrio spinosus L., 1764, represents an Egyptian species, Akis spinosus (L., 1764), which has often been misidentified as Akis trilineata Herbst, 1799, a West Mediterranean species. The holotype of Tenebrio muricatus L., 1758, is Adesmia muricatus (L., 1758), comb. nov., a species appearing in recent publications as Adesmia austera Baudi di Selve, 1881, syn. nov. Two Linnean specimens preserved with the UUMZ types under the unpublished names "Tenebrio impressus" and "Tenebrio variolosus" are an undetermined species of Erodius Fabr., 1775, and Pimelia fornicata Herbst, 1799, respectively. Psammodes gibbus (L., 1760), comb. nov., is the valid name for Psammodes striatus (Fabr., 1775), syn. nov., a South African species. Pimelia gibba Fabr., 1787, and Tenebrio gibbus Pallas, 1781, are synonyms, making the current combination and attribution for this species name Moluris gibbus (Pallas, 1781). Pimelia simplex Solier, 1836, is restored as valid, resulting in changes for three subspecies names: Pimelia simplex simplex Solier, 1836, stat. rest., Pimelia simplex oasis Koch, 1941, comb. nov., and Pimelia simplex substriata Koch, 1941, comb. nov. Two new synonyms are recognized for Centorus elongatus (Herbst 1797): Calcar variabilis Gebien, 1906, syn. nov. (an unavailable subsequent usage of Tenebrio variolosus Fabr., 1801), and Tenebrio variolosus Fabr., 1801, syn. nov.