Approximately 288,000 adultPsyttalia fletcheri(Silvestri), parasitoids of melon fly larvae,Bactrocera cucurbitae(Coquillett), were mass reared in an insectary and released over a 9-wk period in a field containing cucumbers, tomatoes, and zucchini. Dispersing parasitoids were recaptured on yellow sphere traps arranged in a rosette pattern of concentric rings from 10 to 40 m from the release point. At a distance of 10 m from the release point, ≈85% of the recaptured females and 67% of the recaptured males were caught on traps higher than the tallest crop height. Males had a strongly unimodal directional distribution with a mean dispersal vector of 202°, which is downwind from prevailing northeasterly trade winds. Female movement was more variable in direction than males, with a bimodal dispersal distribution to both upwind and downwind directions.