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halictidae
The Halictidae are a very large and nearly cosmopolitan family of the order Hymenoptera consisting of small (> 4 mm) to midsize (> 8 mm) bees which are usually dark-colored and often metallic in appearance. Several species are all or partly green and a few are red; a number of them have yellow markings, especially the males, which commonly possess yellow faces, a pattern widespread among the various families of bees.
They are commonly referred to as "sweat bees" (especially the smaller species), as they are often attracted to perspiration.〔(【引用サイトリンク】publisher=Missouri Department of Conservation )〕 They are likely to sting only if disturbed; the sting is minor.〔(【引用サイトリンク】url=http://bugguide.net/node/view/128 )〕
==Ecology==
Most halictids nest in the ground, though a few nest in wood, and they mass-provision their young (a mass of pollen and nectar is formed inside a waterproof cell, an egg laid upon it, and the cell sealed off, so the larva is given all of its food at one time, as opposed to "progressive provisioning", where a larva is fed repeatedly as it grows, as in honey bees). All species are pollen feeders and may be important pollinators.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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