Flight range studies were begun in July 1972 to determine the flight capability of femaleSimulium slossonaeDyar and Shannon. This information was necessary to conduct successful vector control work involvingLeucocytozoon smithi(Laveran and Lucet 1905) Sambon, 1908 transmission in turkeys.Simulium slossonaewas found to commonly travel up to 4 mi. following an infective blood meal. Throughout the 10–wk study only 4 flies were found to travel 6 mi. and 3 traveled 8 mi. This number of flies moving 6 and 8 mi. would probably not be critical from the standpoint of controllingL. smithiin turkeys.