Remarks on Hymenoptera on urban green roofs in Belgium Author Verheyde, Fons Author Jacobs, JEffrEY Author Dekoninck, WOUTEr Author Achterberg, Kees Van Author Rond, JErOEn Author Blanck, Tim De Author Schoonvaere, KarEL Author Nieuwenhuijsen, Hans Author Ketelaere, Augustijn De Author Minnebo, BarT Author Ferrer-Suay, Mar text Belgian Journal of Entomology 2023 2023-03-03 140 1 37 journal article 10.5281/zenodo.10981934 2295-0214 10981934 EB983FDD-CAE9-48F7-AA63-5F49CC9B6CD1 Lasius brunneus (Latreille, 1798) BELGIUM : • 1 ♂ ; N51.218° E4.398° ; vi/2020 ; J. Jacobs leg.; coll. RBINS ; pan trap (red); W. Dekoninck det. • 1 ♀ (worker); N51.197° E4.463° ; viii/2020 ; J. Jacobs leg.; coll. RBINS ; pitfall trap ; W. Dekoninck det. • 1 ♂ ; N51.197° E4.462° ; viii/2020 ; J. Jacobs leg.; coll. RBINS ; pitfall trap ; W. Dekoninck det. • 1 ♂ ; N51.125° E4.260° ; vii/2021 ; J. Jacobs leg.; coll. RBINS ; pitfall trap ; W. Dekoninck det. • 1 ♀ (worker); N51.184° E4.420° ; vii/2021 ; J. Jacobs leg.; coll. RBINS ; pitfall trap ; W. Dekoninck det. • 1 ♀ (worker); N51.184° E4.419° ; vii/2021 ; J. Jacobs leg.; coll. RBINS ; pitfall trap ; W. Dekoninck det. [6 occ. (2 years), 6 roofs] Remarks: Of Lasius brunneus we found only a few specimens of which 3 males that were collected by hazard after or during nuptial flights. On 3 different green roofs, 1 worker was found each time. Gynes of L. brunneus found nests under bark, in bore holes of xylophagous insects or in crevices of branch breaks, typically in heights between 3 and 22 m above ground ( SEIFERT, 2018 ). Later workers start with active mining of the wood and emigrate to lower parts of the tree stem. Sometimes nests can also be found indoors in wooden constructions of buildings (DEKONINCK et al ., 2021). We assume that the workers found here are not belonging to a nest on the green roofs but probably are foraging from nest in the neighborhood. Hence we do not consider this species as a part of the ant community on green roofs.