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solitary bees?

solitary bees?
Jefferson County, Washington, USA
September 22, 2011
After never seeing any insects around these holes in a sandy bluff on a saltwater shoreline, today there were many solitary bees flying in, around, and out of them. yellow-jacket sized, with strong stripes on their relatively hairless (as far as I could tell through my binoculars watching them 20 feet up the bluff) abdomen. They were too far up the bluff to get a photo of them, but here are some photos of the bluff with all the holes.

Images of this individual: tag all
solitary bees? solitary bees? solitary bees?


Moved from ID Request.
Macrotera. I was going to say M. opuntiae, but I'm not sure if there are other options--hopefully John Ascher will comment. The bees are prickly pear specialists.

more likely Anthophora

Oh, I see
I guess I read "sandy bluff" as "sandstone bluff." Anthophora does make more sense if this wasn't stone.

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