An unexpected new garden species, Gasteruption jaculator [1]. I noticed her at the end of the day flying on the bee hotels which she inspected thoroughly. She parasitizes Hylaeus and Colletes bees [2]. The first group is present on hotels but she did not parasitize a nest and unfortunately did not return after this day.

Literature
1 Nederlands Soortenregister2 van Achterberg, C., 2013. de nederlandse hongerwespen (hymenoptera: evanioidea: gasteruptiidae). Nederlandse Faunistische Mededelingen, 39, 55-87.