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Bacterial symbiotes in the human body louse Pediculus humanus migrate from the mycetome to the lateral oviducts during the adult molt. Their migration was first described by Ries (E. Ries. 1931. Z. Morphol. Oekol. Tiere, 20:233-367.), who examined sectioned specimens with light microscopy. The present study is a more detailed investigation which involves the use of scanning and transmission electron micrographs. The results of our studies confirm Ries' observations. Micrographs are presented of symbiotes emerging from the mycetome, migrating to the reproductive tract, and invading the lateral oviducts.

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Contact application of precocene 2 (6,7-dimethoxy-2,2-dimethylchromene) to inseminated adult female bed bugs inhibited egg maturation and affected egg viability. Third-stage nymphs exposed to 100/ig/cm 2 showed precocious maturation after the moult to the next stage. Nymphs exposed to lower concentrations of precocene exhibited teratism of the antennae, including the reduction of terminal sensillae. This was thought to be responsible for the bugs not assembling.Reduction in the fecundity in adult bugs, and the morphogenetic and teratogenic activity in nymphs was circumstantially related to reduced levels of juvenile hormone, as a result of exposure to precocene.