This parasitic wasp flew zig zag fashion in front of the post in which many native bees and wasps have nested. Then it would land near a hole and insert its antennae into the hole (bottom photos), before inserting its ovipositor to lay eggs (the 3 top photos).
This very long, slender wasp was laying eggs in the nests of other Hymenoptera. This particular wasp disappeared right inside the nest. Read the photos from the bottom. - First she inserted the ovipositor, gradually disappearing inside the hole. The other two photos were taken as she emerged from the hole.