Pompilidae are a cosmopolitan family of aculeate parasitoid wasps with 24 extinct species. Here, we provide a new species description for an enigmatic species of Pepsinae: Paleogenia indomini Colombo & Waichert sp. nov. The new taxon is easily distinguished from congeners by having a long tibial spur, ~0.8× longer than the first tarsomere, and by the presence of a large basal pale line extending medially on the clypeus. A key for the species of Paleogenia is provided.

KEYWORDS: Baltic amber, priabonian, Pepsinae

Wesley D. Colombo, Juanita Rodriguez and Cecilia Waichert. 2023. A Puzzling Spider Wasp: Description of An Extinct Species of Paleogenia Waichert and Pitts (Hymenoptera: Pompilidae) from the upper Eocene. Historical Biology: An International Journal of Paleobiology. DOI: 10.1080/08912963.2023.2189109