Beaus is an unusual genus of small Platygastrid wasps that occur worldwide. Adult Beaus spp. are unbelievably small and are parasitize on egg sacs of spiders of the family Lycosidae. Female Beaus spp. are wingless and phoretic, ‘riding’ on the female spider until her eggs are laid. The female will then lay her eggs inside the spider’s egg, the female wasps’s larvae will then develop inside the eggs until they reach adulthood.