A malee Gasteruption erythrostomum [1], a carrot wasp, on the bee hotel.
The females are permanent residents in the garden, but the males I had not yet seen.
Male Carrot wasps are recognisable by the absense of the ovipositor on the tip of the abdomen.
Literature
1 van Achterberg, C., 2013. de nederlandse hongerwespen (hymenoptera: evanioidea: gasteruptiidae). Nederlandse Faunistische Mededelingen, 39, 55-87.
