[1] Wasps of the genus Eragenia are small, thin, and wiry.
These wasps look almost identical to those of the genus Ageniella, though they are separated by two things: Eragenia has a "trough-like impression on the lateroapical margin of the clypeus", and a "curved, spine-like bristle on the apex of the anterior tibia".
[1] This genus lives in open areas, and at the edges of forests.
It can live in forests as well, hunting in sunny patches.
[1] Eragenia congrua, found in Brazil, uses Corrinid spiders to provision the nests, which are bored in soft wood.