Wow, that is a list. Thank you for the link!If it's a lot smaller than a honeybee, then it is probably a sweat bee. There are so many bees with that coloration. My favorite place to go to for bee identification is http://bugguide.net/
it has many thousands of pictures of bees.
Here's a little sweat bee from my yard.
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Here's one type of leaf cutter bee (there are many)
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Soooo many bees!