The effect of egg separation on embryogenesis in Locusta migratoria at 30°C. The times (mean ± SD) required to hatch for Locusta migratoria eggs kept as a mass (closed bars) or as separated eggs (open bars) at 30°C. Asterisks indicate a significant difference between the 2 treatments at the 5% level with a t-test. Error bars indicate SD. n = 13–20 each.