THE CARBON DIOXIDE RELATED BEHAVIOR OF THE ADULTS OF ORTHOSOMA BRUNNEUM (FORSTER) (COLEOPTERA, CERAMBYCIDAE)

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Abstract
Adult males and mated and unmated adult females of O. brunneum (a wood-boring beetle) were tested in situations where they could select CO2 of different concentrations. Oviposition by the beetles in relation to different concentrations of CO2 was also observed. The males did not respond to CO2. The unmated females occurred most frequently in places containing decaying wood or CO2 of a higher concentration than is present in air. The mated females oviposited most frequently in places where the concentration of CO2 was highest. Carbon dioxide probably plays a role in the selection of sites for oviposition by adult beetles in nature.