Blue Mason Bee Osmia caerulescens (Linnaeus, 1758)
Judging by the recent appearance of Osmia caerulescens in our garden, this solitary species is not as widespread as the more common Osmia bicornis (formerly Osmia rufa). More commonly known as the Blue Mason Bee, Osmia caerulescens females are the reason behind the common name, but the males (illustrated) are quite different with a noticeable shiny metallic gold abdomen. Males are also appreciably smaller than Osmia bicornis males. The females nest in holes in walls and trees, often utilising the exit holes of other invertebrates.
Nottinghamshire (VC56) distribution of Osmia caerulescens
The records for the Nottinghamshire distribution map are currently provided by the following contributors - Trevor and Dilys Pendleton. Duncan Lyon. Barry Lygo. Darren Matthews. Brian Wetton.

You can contribute your own records to help us gain an accurate status of this species in Nottinghamshire. Send an Excel spreadsheet of your records via the 'contact us' link at the top of the homepage.

Updated November 2022

copyright Trevor and Dilys Pendleton ( . .
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