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Metallic blue-green bee - Osmia - female

Metallic blue-green bee - Osmia - Female
Lake Roosevelt, Ferry County, Washington, USA
May 12, 2007
I took this to be Osmia. What do you all think?

Moved from Mason Bees.

Moved from Megachilinae.

Osmia (Melanosmia) female
a Chenosmia (former subgenus)

You are probably correct, but please wait for John Ascher to comment:-)

It looks like this bee is on a constructed mud structure, exposed in the open...I wonder if a mason bee would construct a nest cell like this or if it's something else completely, like just strangely-shaped wood or a wasp nest, like from a pollen wasp.

Mud Cell
In reading a little from American Insects, mason bees do construct cells in open air, "...mason bees, so-called because they construct small, earthen cells on or under stones, in burrows dug in the earth, on twigs or decaying wood, in plant galls, and elsewhere." So the location does make sense, I just wonder if the form of structure fits (can't find a picture anywhere), and the possibilility that a stumpy-looking, hairy Chysidid that likes to loiter on mud nests, could exist (really doubt it, but obviously am not experienced enough to say).

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