Bombus fervidus (?) on swamp milkweed on hardy geranium - Bombus perplexus
Sykesville, Howard County, Maryland, USA June 20, 2015 Size: Rather small for a bumble
I saw these bees around the same time two years ago and have not seen such yellow bees in my garden since. I believe it was midday when I saw them. Someone identified them for me as likely Bombus fervidus, but they seemed so small.