Abstract
SUMMARY. The life cycle of Pentapedilum uncinatum in the Tjeukemeer is briefly described. There are two generations of larvae per year in the mud substrate but only one generation per year in the sand substrate. Changes in chemical composition during the life cycle of P. uncinatum are described, and the data indicate that such changes are not synchronized with particular larval instars but follow a predetermined development pattern for the production of an adult insect. Development appears to be the same in both male and female larvae which results in adult insects that have almost identical percentage composition of chemical substances, but proportionately greater growth in female larvae gives an adult insect that is almost twice as heavy as the male.
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