Photo: Diane Edwardson, March 5, 2010. Yes, it's a metallic green bee or wasp on the native Morning Glories off the Corralitas Public Staircase. (Click on photo to enlarge.)
Coudn't resist the bee wearing the green on St. Patrick's Day. BugGuide.net cites 13 species of metallic green bees (Agapostemon) occurring in the United States, coast to coast. There's also a few green wasps. So if you have more insight, please send us an email: redcarproperty@gmail.com.
You can tell it's a bee or a wasp, rather than a fly, by the body shape. Compare the bee in this post to the fly on last week's giant mushroom.