New data on some hymenopterans (Hymenoptera, Platigastroidea, Scelionidae) of Romania. A number of parasitic specimens of the Telenomus and Trissolcus genera were obtained from some ova of Chrysopa sp., Pentatomidae gen. and Lymantria dispar, laid on Thuya sp., Arctium sp. and Juglans regia in Jassy and Botosani districts. All the ova proved to be infected with Telenomus acrobates and Trissolcus flavipes and only a few of them were infected with Telenomus tetratomus, T. еtiellae, T. рinnatus and T. lineolatus. Three Telenomus species, which were detected for the first time in Romania, are described briefly. Lymantria dispar is considered to be a new host species for them.