The flies included in the infra-order Cyclorrhapha (Muscomorpha) have medical and veterinary importance, since they may produce myiasis and act in carrying pathogens to man and animals. The experiment was carried out at the Federal University of Goiás farm in Goiânia, Goiás, Brazil. Every fortnight, ten dishes black plastic containers containing bovine feces were exposed for fifteen days in the pastures. After this period, the feces were sent to the laboratory for pupae extraction. The experiments were carried out from April 2006 to December 2007. Ninety-two pupae of Brontaea debilis (Thomson, 1896) (Diptera: Muscidae), from bovine feces, from which 31 specimens of Spalangia drosophilae Ashmead, 1887 (Hymenoptera: Pteromalidae) were emerged. The percentage of parasitism was 33.7%. Spalangia drosophilae is cited in the literature as parasitoid of the pupae of Diptera including Chloropidae, Drosophilidae, Muscidae, Sarcophagidae and Sepsidae.