The Purbeck Mason Wasp (Pseudepipona herrichii) is a species of wasp found in Britain.
Being extremly rare in Britain, this species is found only in the heathlands of Dorset, where it appears to have declined since it's discovery, probably due to the loss of it's habitat. This wasp is black with white lines running across it's abdomen, which also has two large orange patches. The legs are orange, and the thorax and head are black, with the thorax having four white spots. Classed as a Red Data Book species in Britain, this species can be abundant where it is found. This species is a parasite to the micromoth Acleris hyemana, and has shallow burrows in sunny spots.