This study had as objective to provide information on the behavior of calliphorideos in places of dairy cattle rearing, in the south of the Rio Grande do Sul. The work was carried out in Centro Agropecuário da Palma, pertaining to Universidade Federal de Pelotas (UFPEL). For capturing the calliphorideos, two WOT (Wind Oriented Trap) traps, baited with 250 g of decompositionbovine liver were used. The traps were displayed at 50 meters from the milking place, seven days per month, within the 10th and the 20th, and the captured specimens were removed from the traps and taken to the Laboratory of Insects Biology for selection, counting and identification. Within the period of March 2007 and the February 2008, 7,225 calliphorideos were captured, being Chrysomya megacephala the most predominant with 3.307 specimens (45.78%). Considering the monthly distribution of the calliphorideos collected in dairy bovine herds for twelve months, in the South of Rio Grande do Sul, monthly variation in the number of captured species was observed, being Chrysomya albiceps (2.445), Chrysomya putoria (90), Lucilia cuprina (118), Lucilia eximia (1.033), Lucilia sericata (41), Sarconesia chlorogaster (73), Calliphora lopesi (113), Hemilucilia semidiaphara (05).