A key to species of the genus Hygroplitis is given. The synonyms of H. russatus, including a parasitoid of Chilo suppressalis, are discussed and a new species is described.
The complex of parasitoids attacking larval stages of Epermenia chaerophyllella in Britain is outlined, and the host range of each of the species recorded (three braconids and four ichneumonids) is discussed. `Ecological' factors, such as the behavioural similarity of unrelated hosts during the vulnerable parts of their life histories, seem...