Abstract
ABSTRACTFour milkweed associated insects were assayed for free D‐alanine by gas‐liquid chromatographic methods. Oncopeltus fasciatus and Lygaeus kalmii, reared aseptically on milkweed seeds, showed high titres of free D‐alanine. Labidomera clivicollis showed traces of the D‐isomer whereas none could be detected in Tetraopes tetrophthalmus. O.fasciatus reared aseptically on sunflower seed showed high titres of D‐alanine. No D‐alanine could be detected in milkweed seed hydrolysates. Several museum specimens of the orders Hemiptera and Homoptera were assayed and all showed high titres of D‐alanine.
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