A small Anthophorid (?) in Phacelia distans. Saw just a few of these, very busy, constantly moving. Will try to get better pictures tomorrow.
Scopa seem to indicate that it has been collecting pollen (+?) these Phacelia flowers.
Update: Calliopsis (Nomadopsis)
acc. to John Ascher (see comments below).
Please see also separately posted images of this sp. here: 1