Abstract
Elimination chromatin observable in the middle of the bivalents in oogenesis of the geometrid moth species Cidaria variata (subgenus Thera) differs distinctly from the chromosomal chromatin by being less electron dense after uranyl acetate staining. Elimination chromatin is tightly packed in between the bivalent halves already at metaphase I, and is bursting out from between the bivalents leaving the centre of the bivalents as a hollow cavity. There is a distinct tendency for elimination chromatin to stick adjacent bivalents together. In the electron microscope it seems to have an unorganized, fibrillar appearance. The thickness of the fuzzy fibers is in the range of 100 a. Three possible hypotheses have been raised to account for the elimination of ribonucleoprotein material from chromosomes in lepidopteran oogenesis.
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