Abstract
Periodic dissections of adult female Sitona cylindricollis Fahraeus showed that the reproductive system remains underdeveloped and unproductive prior to hibernation. Only overwintered females showed fully developed and productive systems. Separation of males from females of the overwintered, producing populations showed that very frequent or continuous contact with males is necessary for sustained production of oocytes and eggs by females. Separation of the sexes for very brief periods leads to gaps in the chains of oocytes; longer periods cause complete cessation of oocyte production.
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