Abstract
The taxonomy, distinctive features, life histories, seasonal occurrence, incidence of parasitism in different hosts and at different times, and the economic significance of 23 species of primary parasites of grasshoppers are described. Three species of hyperparasites are similarly discussed. The information is based on field collections made in Western Canada in 1938 to 1953 and on laboratory studies at Belleville in 1939 to 1955.
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