Technical Abstract: Attractants for female medflies are of particular interest in monitoring programs where sterile males are released to eradicate incipient populations. A female-targeted trap also could assist the monitoring of mass-trapping suppression efforts in areas of established populations. In bioassays that tested the ability of male acoustic courtship cues to attract females, broadcast male calling song was found to significantly affect female medfly behavior. However, the tested song did not induce phonotaxis, and it affected female behavior over a relatively short, <0.5-m distance, even at high signal levels. Further increases in attractivity may result from addition of olfactory (pheromonal stimuli) or visual attractants that mimic the environments where leks form most frequently.