The origin of the worker behavior in the bees-The investigation by the individuals of less reproductive capacity produced from the artificial rearing-

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Females of a bivoltine, basically solitary bee, Lasioglossum scitulum were reared in the greenhouse at the campus of Shimane University. The artificial nests were also used to manipulate the amount of larval food to produce "smaller" females artificially. The annual life cycle occurred at the small cage normally in the greenhouse. By using the newly developed artificial nest in this study, smaller females were obtained. The smaller females produed relatively low number of cells during the brood rearing period.