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Relative size of last instar and adult syrphid.

Line art illustration of insect size in comparison with a 1-inch ruler also marked in mm, a bug box Credit: Celeste Green in Smith RF, Hagen KS. 1956. Enemies of spotted alfalfa aphid. Calif. Agric. 10(4):8? 10. Adult from Cole FR. 1969. <i>The Flies of Western North America.</i> UC Press. Berkeley; CA. Adapted by UC IPM.
Credit: Celeste Green in Smith RF, Hagen KS. 1956. Enemies of spotted alfalfa aphid. Calif. Agric. 10(4):8? 10. Adult from Cole FR. 1969. The Flies of Western North America. UC Press. Berkeley; CA. Adapted by UC IPM.
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