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Over the course of this year nest specimens from four of the ve Colletidae subfamilies and annalyzed their properties. It was demonstrated by previous work at this institution that the nest cells of at least one specie of Colletidae were not in fact just layers of polyester, but a composite of polyester and silk. The aforementioned work culminated in a Masters thesis at the University of Bath by Rebecca Belisle (Belisle 2011.) The focus of this research was to compare nest cell characteristics with what we know about the nesting behavior of the bees across all subfamilies, the documentation of which is extensive. It was found that the nesting behavior of each subfamily heavily correlated to the cell characteristics observed under our testing.