Abstract
A unique chordotonal structure in the fore coxae of adult male and female bruchid beetles, Callosobruchus maculatus (F.) and C. subinnotatus (Pic), is described. The structure is a heavily sclerotized cuticular cone that is recessed within an opening in the medial surface of the coxa. Perpendicular to the cuticular cone is a pair of scolopidial sensilla with bipolar neurons, cap cells, scolopale sheath, and accessory cells. Unlike scolopidia described from other insects, these sensilla have a free distal tip that opens into a crotch in the distal inside surface of the coxa.
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