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Lasioglossum (Evylaeus) sp. m
Sweat Bees found along with honey bees on the chrysanths.
http://www.pbase.com/lejun/flowerflies - source
Found a whole lot of them probably belonging to the family of hover flies and flower flies. Thanks to BugEric for the ID and info. The ones I found resemble: Sweat Bees (Halictidae) » Halictinae » Halictini » Lasioglossum » Subgenus Dialictus (Lasioglossum Subgenus Dialictus) -source bugguide.net (pls view ref)