Spohr

Predatory wask looking for nesting hollows of solitary bees to lay eggs.

The propleura form an elongated "neck", the petiole is attached very high on the propodeum, and the hind tibiae are swollen and club-like. The females commonly have a long ovipositor (except in the genus Pseudofoenus), and lay eggs in the nests of solitary bees and wasps, where their larvae prey upon the host eggs, larvae and provisions.
The absence of "teeth" on the crown of the head and the somewhat thickened antennae readily separate these wasps from those in the unrelated family Stephanidae, which also contains very slender wasps with long necks. (Text Source: iNaturalist)
Spohr

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