The examples of click series of noctuid moths Amphipyra perflua F.: a - in partially restricted flight in "carousel" device; b-d - in tethered flight. Vertical lines sketch the clicks out, adjacent to them the values of interpulse interval multiplicity of wing-beat period are given. Continuous lines on the oscillograms (c, d) reflect the horizontal movement of a moth, quick oscillations correspond to the separate  wing-beats.