Abstract
The structure and histochemistry of the venom glands i.e. the acid glands of the wasp species Microbracon hebetor Say and Philanthus triangulum F., were studied. In M. hebetor only one type of cell was present apparently in an active and an inactive form. No changes caused by aging or degeneration were observed. In P. triangulum different types of cells were found which however may represent aspects of development, function and degeneration of one type of secretory cell. In M. hebetor no accumulation of secretion products was present in the cells, secretory material being only observed in the secretory organelle. In P. triangulum, vacuoles, either empty or filled with secretion, are present in some developmental stages of the cell. The histochemical results were inconclusive.
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