Abstract
ABSTRACT. The calling posture of Spilosoma congrua Walker (Lepidoptera: Arctiidae) affects local airflow in ways that may impact on the release of chemical signals. Dried specimens of S. congrua imitating resting moths, calling moths, and moths with intermediate postures were placed in a wind tunnel. The wind speed was measured near the abdomenal tip where sex pheromone emission occurs. The calling posture, wings‐up, gave significantly greater mean wind speeds near the surface of the sex pheromone gland, effectively eliminating the dead air space that surrounds a non‐calling moth. The calling posture also decreased the relative intensity of turbulence near the pheromone gland surface.
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