I looked around to see if I could identify it--but no luck so far. And since I'm still not really familiar with bumblebee field marks, I didn't get all the pictures I should have to make identification easier.
The bee is on a dicentra (bleeding heart), not spectabilis, but a more modest, possibly wild variety. I'm attempting to confirm its identity as I write..... Okay, I'm pretty sure it's Dicentra eximia (fringed or wild bleeding heart). It's a very popular plant with the bees.