Four bopyrids are described. Pleurocryptina indica Nz. & B. à 8., 1929, is recorded from Mauritius; it was previously known from the East Indies. Bopyrina brachytelson Nz. & B. à 8., 1923, is compared with other members of the genus. Metacepon pleopodata n. sp., a parasite of Litocheira setosa collected in Amboina (Indonesia), is a species with an aberrant male morphology. Another species, parasitic on Metopograpsus oceanicus in Sumbawa (Indonesia), is tentatively attributed to Megacepon, a genus with uncertain affinities.