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Relative size of adult Trioxys pallidus, a parasite of walnut aphids, Chromaphis juglandicola.

Line art illustration of insect size in comparison with a 1-inch ruler also marked in mm, a bug box Credit: Goulet H, Huber JT. 1993. Hymenoptera of the World: An Identification Guide. Agriculture Canada, Ottawa, Ontario. Adapted by UC IPM.
Relative size of adult Trioxys pallidus, a parasite of walnut aphids, Chromaphis juglandicola. Credit: Goulet H, Huber JT. 1993. Hymenoptera of the World: An Identification Guide. Agriculture Canada, Ottawa, Ontario. Adapted by UC IPM.
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