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Red Mason bee?

Observed: 13th May 2012 By: mh6338mh6338’s reputation in Invertebrates
Red Mason bee 3
Red Mason bee 1
Red Mason bee 2

I saw about 20 of these coming back & forth to a robinia tree in my garden. Some were crawling into holes in the tree, where they would stay for a short while, then fly away again.
My initial thought is that they are red mason bees, but they also look a bit like tawny mining bees. However, I thought those are solitary bees. Anyone got any ideas?

Species interactions

No interactions present.

Species with which Red Mason Bee interacts