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For Insects, Spiders & Their Kin
For the United States & Canada
Osmia? - Osmia lignaria

Osmia? - Osmia lignaria
Bill Williams River NWR, La Paz on Border with Mohave County, Arizona, USA
March 6, 2013
Very busy "hive." Bees would emerge from tunnels with balls of mud in their mandibles etc. I assumed they were excavating a hive, not mining mud to make nests elsewhere. I observed another such "hive" about 1.4 mile down-river.

Low bank riverside in cottonwood-willow riparian forest.
Elevation: 480 Ft. (146 m).

Even images shot at 1/2000 didn't turn out good.

Images of this individual: tag all
Osmia? - Osmia lignaria Osmia? - Osmia lignaria

Moved from Mason Bees.