Descriptions of the adults, eggs and planidia of a new species of Lophyrocera (Hymenoptera: Eucharitidae) from north-western Argentina (Tucumán) are provided. Females deposit their eggs into the fruits of the shrub Vassobia breviflora (Sendth) (Solanaceae). The host of L. variabilis is an unidentified species of Camponotus Mayr (Formicidae: Formicinae).
Pentatomid adults of the species Dichelops furcatus (F.), collected on stubble of soybean, Glycine max (Linnaeus) Merril, in Santa Fe province of Argentina, were found parasitized by two encyrtid wasp species (Hymenoptera: Encyrtidae). One of the encyrtids is described as Hexacladia dichelopsis Torréns & Fidalgo, sp. n., from both sexes, and the other species H. smithii Ashmead, is recorded for the first time from D. furcatus in Argentina. Both species are gregarious endoparasitoids which carry out the whole development (larval and pupal) in their living hosts; they emerge as imagoes, by cutting their way out through the dorsal wall of the abdomen. Including the newly described H. dichelopsis, seven species of the genus are recorded from South America, and an identification key to separate them is presented.
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