The tortured nomenclatural history of the Chilean species Endophloeus flexuosus Solier, 1849 and Endophloeus angustatus Solier, 1851 is reviewed. These species have had dual parallel and independent histories as members of the Zopheridae: Colydiinae and Tenebrionidae. The genus Phloeopsidius Gebien, 1925 was proposed for these two species in the Tenebrionidae. Phloeopsidius regularis Kulzer, 1966 and Phloeopsidius collaris Kulzer, 1966 were later added to the genus, also as Tenebrionidae. While concurrently treated as colydiines, the two Solier species have been treated in a variety of genera, most recently as Sparactus flexuosus and Endophloeus angustatus. Phloeopsidius is removed from the Tenebrionidae and placed as a new synonym of Pristoderus Hope, 1840 in the colydiine Zopheridae. The four species are all correctly placed in the Colydiinae, as Notocoxelus angustatus (Solier), new combination, Pristoderus flexuosus (Solier), combination revalidated, Pristoderus regularis (Kulzer), new combination and family placement, and Pristoderus collaris (Kulzer), new combination and family placement.