Abstract: In accordance with an illustrative embodiment of the invention disclosed herein, an apparatus for electrocuting insects, particularly flies, includes an open-topped but otherwise enclosed structure, a grid horizontally disposed near the top of said structure, said grid has a plurality of closely spaced pairs of conductor wires charged to a moderately high potential difference, means for producing over a prolonged period a dry odor that is highly attractive to flies and the like, and means for supplying the odor to, and releasing the odor in, a region within the structure below the grid.