Infestation of Flour by Tribolium castaneum:1 Relationship between Distribution of Eggs and Adults in a Dispersing Population

The distribution of eggs and adults of Tribolium castaneum (Herbst) within a 10.2-cm wide × 15.2-cm high × 0.64-cm deep column of flour was determined 3, 6, 12, 24, and 72 hours after the adults were placed on the upper surface. The average depth at which eggs were recovered was always about 79% of the average depth at which the adults were recovered, although the average depth for both increased with time. Since individual females laid eggs in clumps, the eggs at 24 and 72 hours after the introduction of the adults occupied less than a mean 16 and 28%, respectively, of the area available for oviposition.