Young adults ofT. castaneumleft their habitats sooner at higher adult densities and In the presence of large larvae. The rate of emigration by adults ofT. confusumwas not strongly influenced by initial density, and cohorts tended to cease emigration at ca. the same level in all density treatments. However, emigration byT. confusumcontinued as long as large active larvae were present. Actual numbers of progeny were more uniform than could be explained by differential emigration alone. The trend toward uniformity is discussed with respect to the facultative reduction in fecundity by crowded adults, and the cannibalism of eggs by non-emigrant adults and their developing larval progeny.