Abstract
Norrbomia frigipennis (Diptera: Sphaeroceridae) is phoretic on dung-feeding scarab beetles (Coleoptera: Scarabaeidae). In this study we investigate the attractiveness of three beetle species,Phanaeus ignius, P. vindex, andCanthon pilularis, to the fly. Stationary, moving-dead, and live beetles were used. More flies were attracted toPhanaeus. However, this attractiveness may be due to the larger average size ofPhanaeus. A preference for larger individuals was found withinPhanaeus, though not withinC. pilularis. Flies mounted beetles on the thorax and the elytra at similar rates.Phanaeus males that possesed horns did not attract more flies than did hornless ones, and there was no effect of host sex on attractiveness. In hornedPhanaeus, about 11–16% of the flies mounting those beetles landed on the horn.
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