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Solitary bee ? What species ?

Observed: 26th June 2011 By: phildean
Berks, Bucks and Oxon Wildlife Trust
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IMG_3407-1
Description:

I unfurled our garden sunshade in response to today's hot weather. In one of the folds there were about 20 pupae in a line, each one separated from the next by mud and there was also a lot of pollen in some of the cells. Each pupa is about 14mm long and 7mm diameter. Presumably this is some sort of mason bee. But what sort? The pupae seem very large.

Identifications
Species interactions

No interactions present.

Species with which Osmia rufa interacts