Registered: November 2005
The females of this parasitic wasp lays its eggs by its long ovipositor on the body of larvae of solitary bees or wasps. On hatching its young larvae will devour grubs and supplies of pollen and nectar of its victim. The adults grow up to 10–17 millimetres (0.39–0.67 in) long and can mostly be encountered from May through September feeding on Apiaceae
Gasteruption jaculator has been found visiting various flowers, or hovering around the nests of solitary bees and wasps in gardens and meadows. The species is commonly found during May to September.
Info courtesy of Wikipedia.