Abstract
Cells of the inactive corpus allatum of the bug, Eurygaster integriceps, are characterized by their small size and by an insignificant amount of cytoplasm around the spherical or ovoid nuclei. Smooth-surfaced endoplasmic reticulum is entirely absent. Separate, short cisternae of granular endoplasmic reticulum and numerious free ribosomes are present. The nucleolus is compact or loose, rarely with small vacuoles. In mature females corpus allatum cells are bigger and richer in cytoplasm. Smooth-surfaced endoplasmic reticulum are absent here also. Granular endoplasmic reticulum is highly developed. A few free ribosomes are present. The nucleoli are mainly in the form of hollow spheres. The functional significance of the changes observed is discussed.
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