Another was this one, which may be Bombus flavifrons, which translates to Yellow-fronted Bumblebee. Note the may be--I'm not confident about the ID.
Then there was this all-over lemon-yellow, very furry individual. She was fast-moving, and I had to go back and forth over the porch railing to track her down. Online bumblebee identification schemes have not worked. She is, for now, a mystery bee. (Help?) Another photo below: