Abstract
An aggregation of the oil-collecting bee Epicharis dejeanii Lepeletier was studied at Ilha das Flores, southern Brazil. Data on seasonality, types of floral resources collected, and nesting biology were registered. The nesting area occupied 120 m2 with density of up to 8 nests/m2. The tunnel entrances remained always open and surrounded by a tumulus. Adult activity lasted approximately 70 days. The females built the nest, provisioned food, and layed the egg in 4 days. The nest’s architecture was very diverse, and they were between 40 and 140 cm in depth with one or two brood cells at the end of the tunnel. Diapause occurred in the postdefecating larval stage, and there was no cocoon. Immature stages and nest architecture are described and illustrated.
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