This is a common European honey bee trying to clean pumpkin pollen off of itself. The trick is to wait for them to get busy doing something so that I can get close. More tips on shooting bees here: [link]
I have always wanted a GOOD Macro lens. I have a Tokena(spelled wrong?) and don't get to use it often, and it is nice, but doesn't gather much light. Oh! Do you know if the pollen affects their flight when they're covered like that? I would think so, but I don't know.