Priochilus captivum is a species of neotropical spider wasp in the family Pompilidae.

Nesting sites chosen include among the folds of clothing, inside shoes, in cardboard boxes, behind books on shelves and in brick cavities.

[3] The nest consists of a number of individual cells and is built of pieces of dry twigs and bits of gravel cemented together with mud.

They are built on concealed horizontal surfaces and lie on their sides, touching each other, but not sharing a common wall.

The mud takes about two hours to dry, and then the spider is placed inside, an egg is laid on its abdomen and the cell is sealed.