For several years the Farnham House Laboratory of the Imperial Institute of Entomology has been making a study of the parasites of Diprion spp., in order to acclimatise the most important of them in Canada. Dr. K. R. S. Morris has been specially engaged on this investigation in Czechoslovakia and Hungary, and this year (1935) has discovered some parasitised eggs of Diprion sertifer, Geoffr. Almost at the same time, other eggs of the same host, sent from Sweden, were found to be parasitised by some Chalcids, but belonging to another species. Experiments are actually being made to breed and acclimatise these two species in Canada. Both are Chalcids belonging to the family Eulophidae, sub-family Entedoninae. As very little is known about these egg-parasites of sawflies, we are giving notes and descriptions of these two species, of which one proved to be new.