Abstract: An insect trap is disclosed having a source of ultraviolet (UV) light to attract flying insects, the source being supported above a pan of water on the surface of which a petroleum liquid such as oil or kerosene is floated and into which the insects fly and are exterminated, the trap also comprising overflow means for ensuring that excess water tending to fill the pan actually overflows while at the same time the said means inhibits the spilling of oil or kerosene over the surrounding property.