Seems like she couldn't find her nest. I followed her for a while as she checked out 3 other locations before finding the right one. Don't know what is in her mandibles in the second pic
Individual was arriving to a known nesting aggregation of Andrena clarkella. I tested her ability to sting me, and she was unable to.
clypeus somewhat taller than miserabilis, and white not yellow; patrolling cardamine douglasii
A. arabis? White clypeus, but I haven't seen this species before so I'd appreciate a second opinion. Unsure about facial proportions, and when I put it through DiscoverLife it eliminated arabis when I selected 'absent or obscure pitting' for the scutum, which is what it appears to be here (in any case the scutum and terga appear heavily tessellated). Also, it kind of looks like there's a tiny bit of white on the paraocular areas next to the clypeus on either side, so not sure what that's about. Average-sized, not small like a male ziziae or such. On Cardamine.
I had one of these parasitic beetle larvae on a Nomada a few years ago but I can't remember what type of larvae or the name for the larvae. I think the bee is a male Andrena cressonii.
On salix. please correct. I am not confident with this id and I don't know how to id bees yet.