While endeavoring to work out the complete life history of Polites manataaqua Harris (Hesperiidae) it was observed that the progeny of one female included an unusually large number of anomalous individuals. These exhibited segmental defects, spiral segmentation, and irregularities of thoracic leg structure. It seems advisable to report these observations in detail because of the paucity of facts regarding phenomena such as spiral segmentation in insects other than Drosophila .
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