Since the discovery of the Oriental Peach Moth in Ontario in 1925, yearly studies have been conducted to determine the extent to which our native parasitic hymenoptera have transferred their attention to this new source of host material. These studies have disclosed 15 of our native species attacking the Oriental Peach Moth, but as yet, little assistance in the form of actual control has developed from their efforts. During 1929 only 2.2 per cent. of 3298 larvae reared were parasitized by them; thus it seemed advisable to attempt the introduction of species which have proven of major importance in controlling the pest in areas of older infestation.