The larvae of the aphid lion Chrysoperla carnea (Steph.) were reared on a semi-arti®cial diet for laboratory rearing. Algae, Chlorella vulgaris Beij was used as a source of protein for the nutrition of the predator. Feeding the newly hatched larvae of the predator on water extract of the algae by using a small piece of sponge, extended the larval duration up to 30 days, and the larvae failed to pupate. The addition of carbohydrates, salts and vitamins was necessary to the larvae to complete their development to reach the pupal and adult stages. Normal adult longevity and egg deposition were obtained after the addition of the carbohydrates, salts and vitamins.
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