A male of the Sweatbee Lasioglossum calceatum^{[1, 2]}. This common species is present in the garden every year. A beautifull striking bee. 

The male is recognizable by the red dorsal plates and the long black antennae. Females can also have red dorsal plates but in the Netherlands that is less likely^[2].
The females excrete a sweet smell^[1].

Females of Sweatbees have a groove in the tip of the abdomen^[1]. This is a social species that build a colony.

 

26 July 2019

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A very dark colored male. He hung around a group of Common ragwort plants for weeks.

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Literature

¹ wildebijen.nl, "De Nederlandse bijen en hun relaties, overzicht van in Nederland en Vlaanderen voorkomende solitaire en sociale bijen (Apidea s.l.)"

² Peeters, T.M.J., H. Nieuwenhuijsen, J. Smit, F. van der Meer, I.P. Raemakers, W.R.B. Heitmans, C. van Achterberg, M. Kwak, A.J. Loonstra, J. de Rond, M. Roos & M. Reemer, 2012. De Nederlands bijen (Hymennoptera: Apidae s.l.). - Natuur van Nederland 11, Naturalis Biodiversity Center & European Invertebrate Survey - Nederland, Leiden.