Portland, Multnomah County, Oregon, USA May 22, 2015
Haven't been watching bees as closely as I would like for a season and a half so feeling very rusty. This just doesn't quite look like any of the species I see most frequently around here or maybe I am rusty.
On Phacelia spp.
I also think it may be same species as http://bugguide.net/node/view/1075948/bgimage which I also just posted.