Abstract
A biological study of the parasites of aphids was begun early in the summer of 1920, after many observations during an outbreak of Aphis gossypii Glov. on cotton in North Carolina had demonstrated the economic importance of the parasites and predators in natural control of the pest, and had aroused great interest by their efficiency. In the course of the work, similar parasites of other aphids were encountered, and hyperparasites were found closely associated. A general investigation of these insects and their interrelations followed. Opportunity for study of the Aphid parasite Complex in Ohio was afforded in 1921, and the project was continued there until July, 1922.
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