This solitary bee was encountered excavating sand and small granitic particles from beneath this ~1-1.5" rock as I was descending the Borrego Palm Canyon Alternate Trail. I observed it for several minutes as it aggressively shoveled out small grains with its legs.
on Geum macrophyllum
Observed in a Sidalcia sparcifolia flower. I came across Osmia lignaria ssp. propinqua in iNat but only four recorded in SD county. (Spider mite in #8 is incidental as it never shows up in any other photo.)
1217, 67F, sunny, 7 mph
1223, 67F, sunny, 9 mph
Really aggressive. Got stung and pursued for another 25 yard up the trail! second photo is stinger pulled out of my face!
Seen at tiny Spiny Redberry flowers.
On nonnative Glebionis coronaria
Female emerging from her nest hole (in reverse order)