Abstract
All stages in the life cycle of Pieris brassicae were studied for carotenoid content. It was found that the ova possess a large quantity of β-carotene which must have its origin from the female. The physiological importance of β-carotene at this stage in the life cycle is discussed. By comparing the carotenoid content of the food taken in by the larvae with that of the frass output an estimate of the β-carotene incorporation was obtained. The actual β-carotene content of the larvae was determined and was found to be lower than the estimate. It would appear that a considerable proportion of β-carotene must be metabolized.
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