Pit building antlions \textit{Euroleon nostras} have been submitted to artificial cues in order to delineate their faculty to localize a prey. Series of propagating pulses in sand have been created from an extended source located at a large distance from the pit. The envelope of each pulse encompasses six oscillations at a carrier frequency of 1,250 Hz and up to eight oscillations at 1,666 Hz (yielding a wavelength of the order of 7 to 10 cm). In one set of experiments, the first wave front is followed by similar wave fronts and the antlions respond to the cue by throwing sand in the opposite direction of the wave front propagation direction. In another set of experiments, the first wave front is randomly spatially structured while the propagation of the wave fronts inside the envelope of the pulse are not. In that case, the antlions respond less to the cue by throwing sand, and when they do, their sand throwing is more randomly distributed in direction. One concludes that the localization of vibration signal by antlions are based on the equivalent for hearing animals of interaural time difference in which the onset has more significance than the interaural phase difference.