The gall midges of St. John's Wort (Hypericum spp.), with descriptions of two new species

Characters are given whereby the gall midges attacking St. John's Wort (Hypericum), a noxious weed, may be distinguished.Four species, Dasyneura hyperici (Bremi), D. serotina (Winnertz), Macrolabis marteli Kieffer and Zeuxidiplosis giardi (Kieffer), inhabit leaf galls in Europe.One species, Dasyneura toweri Felt, inhabits the flowers in the U.S.A. Three species, Contarinia hyperici, sp. n., Clinodiplosis hyperici, sp. n. and Lestodiplosis (Coprodiplosis) sp., live in the unopened flowers in Europe.Two species, Lasioptera virginica Felt and Cecidomyia ? triadenii Beutenmüller, are recorded as attacking the stems in the U.S.A. The latter is a name given merely to a gall.Four species, Geocrypta braueri (Handlirsch), G. hypericina (Tavares) (perhaps a synonym of G. braueri), Trisopsis hyperici Tavares and Lestodiplosis (Coprodiplosis) hyperici (Tavares), live in underground galls in Europe.Descriptions of Contarinia hyperici, sp. n. and Clinodiplosis hyperici, sp. n. are given.