The effect of the time of separation of Locusta migratoria eggs on the hatching time. The differences in mean hatching times between eggs separated and those kept in contact with each other (controls) are plotted against the time of egg separation gauged based on the mean hatching time for the control eggs (A). SDs of the mean hatching times are plotted against the time of egg separation gauged based on the mean hatching time for the control eggs kept in masses (B). Open and closed circles indicate eggs separated and those kept in masses, respectively. Each datum point is based on 16–20 eggs.