Abstract
Contact chemoreceptive sensilla on the aboral margins of the labella are sensitive to water, sucrose, and sodium chloride in the 3 female tabanids studied. The labellar receptors play a major role in “triggering” sucking action, following detection of acceptable substrates by the fore tarsi. Labellar acceptance thresholds for sucrose were 0.0025M–0.005M, 0.015M–0.031M, and 0.0125M–0.0625M in Chrysops vittatus Wiedemann, Hybomitra lasiophthalma (Macquart), and Tabanus lineola F., respectively; the labellar rejection thresholds for NaCl in 0.5M sucrose were 0.50M, 0.70M, and 0.60M–0.70M, respectively. The labellar contact chemoreceptors had lower acceptance and rejection thresholds than those of tarsal sensilla.
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