The daily oviposition rhythm ofS. pictipeswas determined in the laboratory. Mated females were kept for 4 days under 2 constant temperatures and 3 thermoperiods, and a 16:8 L:D photoperiod. In all regimes, the oviposition occurred during photophase, with the mean in the late photophase.The mean time of oviposition at the thermoperiod 26.7:16.7°C was advanced compared to that at a constant temperature (26.9°C) about equal to thermophase temperature. A small 2nd peak of oviposition occurred at the very end of photophase under all thermoperiods.