Abstract.Eriopeltis varleyifrom Wytham in Britain is described as new. The adult female and male are described and all stages are illustrated. Keys are provided for the identification of all known species ofEriopeltis,and to the males of the three species known from Britain.E. varleyiis univoltine and apparently specific toBrachypodiumpinnatum(L.) Beauv. Males and females occur in equal proportions, but many more males were produced when populations were reared under very warm dry conditions in the laboratory. The population studied at Wytham was parasitized by a number of species of chalcid wasps and a chamaemyid fly egg predator.
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