The effect of the time of pairing of Locusta migratoria separated eggs on the time of hatching. The differences in hatching time between the paired eggs and control eggs kept as separated eggs are plotted against the time of egg clumping gauged based on the mean hatching time for the control eggs (A). Comparison of SDs of the mean hatching times (B) and the intervals of hatching in each pair (C) for the clumped eggs (closed circles) and the control eggs (open circles). Each datum point is based on 18–24 eggs.