Three introduced species of hymenopterous parasites of the European pine shoot moth, Rhyacionia buoliana (Schiff), were released in Waterloo County Reforestation Area, near Elmira, Ontario, from 1955 to 1957: Ephialtes ruficollis (Grav.) and Eulimeria rufifemur (Thorns.) (Ichneumonidae) and Tetrastichus turionum (Htg.) (Eulophidae). This is an account of their life history and behavior.
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J. A. Juillet (1959) studied this question.
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