Osmia caerulescens, Blue Mason Bee

Common Name: Blue Mason Bee

Osmia caerulescens, more commonly known as the Blue Mason Bee, is around 8 to 10 mm in length. The females (pictured above) have a blue metallic lustre to the abdomen giving rise to its common name, Blue Mason Bee, with black pollen-collecting hairs underneath. The males are bronze with pale yellow hairs and a shining slope at the front of the abdomen that distinguishes this species from other bees. Usually found around forest edges and clearings, flower meadows, orchards, parks and gardens.

On the wing from April to August/September. Nests in holes, often existing cavities in dead wood and plant stems, rocks and mud walls. The female deposits her egg, adds food for the larvae, builds a small wall out of chewed leaves and creates the next chamber, where she will deposit the next egg. Widespread in England and Wales, but not usually occurring in great numbers, though more common in the south.

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