Synacra paupera Macek, 1995 - Belg. sp. nov. BELGIUM: • 1 ♀; N51.184° E4.419°; viii/2020; J. Jacobs leg.; coll. FV; pitfall trap; F. Verheyde det. Remarks: This small genus of diapriid wasps can be recognized by the number of antennal segments in females (12) and the melanic to yellow body (KOZLOV, 1988). Determination to species used to be difficult but recently a new key appeared. S. paupera is one of the easier species to recognize by the presence of fully developed notauli and the clavate female antennae apically (A8-12 distinctly compressed) (CHEMYREVA & KOLYADA, 2019). Interestingly, this species is a known parasitoid of the sciarid fly Bradysia impatiens (Johannsen, 1912) (= Bradysia paupera Tuomikoski, 1960); which is a known pest species in greenhouses (NOTTON, 1997).

Published as part of Verheyde, Fons, Jacobs, JEffrEY, Dekoninck, WOUTEr, Achterberg, Kees Van, Rond, JErOEn, Blanck, Tim De, Schoonvaere, KarEL, Nieuwenhuijsen, Hans, Ketelaere, Augustijn De, Minnebo, BarT & Ferrer-Suay, Mar, 2023, Remarks on Hymenoptera on urban green roofs in Belgium, pp. 1-37 in Belgian Journal of Entomology 140 on page 20, DOI: 10.5281/zenodo.10981934