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Sitona humeralis Steph. has one generation per year. Adults survive through the winter. Full life cycle from egg to adult lasts 54 days on average, including about 10 days for embryo, 30 days for larval and 14 days for pupa stage.
The immature stages of Rugilus rufipes Germar are described and illustrated. Descriptions are based on material collected in the deciduous forest litter in northern Poland (Niedwiady Forest District), and reared in the laboratory. The life-cycle and notes on biology of the species are also provided.
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