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Mining Bees

Yesterday afternoon I came across lots of small bees emerging from burrows in a patch of sandy soil on the south bank of the large large lake.  They are probably mining bees of the genus Andrena, possibly Andrena bicolor (Hymenoptera: Andrenidae).

The males were distinctly smaller than the females and did not have the reddish hairs on the thorax:

Photos taken in Whiteknights Park, Reading University grounds, Reading, UK, on 2012-03-14.

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