Queen and worker honey bees are phenotypes, and the differentiation of castes depends upon the food received during larval life. Little is known concerning the time during development that dimorphic differentiation begins, at what time it becomes irreversible, the extent to which the various organs may develop into intermediates between typical queen and worker organs, or the extent to which the various organs that develop dimorphically are correlated with each other in the degree to which they develop into queen or worker types. If individuals can be produced with organs that are intermediate between those of typical queens and workers, or if extreme dimorphic variations in the various organs are not correlated with each other, then the female honey bee is potentially polymorphic, and some mechanism must operate to maintain the fairly strict dimorphism found in nature.