Abstract
The hemocytic changes that attend parasite encapsulation and melanization in larvae of Drosophila, Musca domestica, and Orthellia caesarion are very similar to those changes occurring in noninfected individuals at metamporhosis. Some of the changes include the precocious differentiation and migration of hemocytes. Comparative and quantitative hemocytological data suggest that some stimulus in infected larvae, acting directly on the hemocytes or on the mechanism(s) controlling their activity, causes the cells to leave areas of the body where they are normally found and to encapsulate parasites. Questions concerning the origin and mode of action of the initial stimulus are raised, and as a basis for future experimentation it is proposed that the cellular immune reactions of these insects against internal metazoan parasites result from a hormonal imbalance.
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