The nesting behaviour of Prionyx fervens (Linnaeus, 1758) is described, based on one nesting female observed in a coastal environment from southeastern Brazil. One prey bearing a wasp's egg was created in laboratorial conditions and aspects of the larval behaviour and development are described. Schistocerca cancellata (Serville, 1838) (Caelifera, Acrididae) was found as prey.
Immature; reproduction; Sphecini; wasp