Abstract: A device for catching and exterminating flying insects is disclosed, which is suitable for commercial use in dairy barns, horse barns, and the like. The device includes a housing which encloses an exhaust-type fan in its lower portion, and a disposable mesh collection bag supported above the fan. The mouth of the collection bag is situated at a constriction or throat, near the top of the housing. Above this throat the housing flares outwardly and upwardly, defining an upper inlet into which insects are drawn when the fan is in operation. Means for attracting insects to the vicinity of the inlet are mounted thereabove. Continuous operation of the exhaust fan draws insects into the back and holds them there, while the large volume of air drawn through the collection bag exterminates trapped insects by dehydrating them.