Photo: Diane Edwardson, July 23, 2011. A neighbor found a dead, iridescent green-blue bug in her bathroom. (Click on photo to enlarge.)
Perhaps it's a green bee. I found a very similar one on Bug Guide. There are at least 13 species of green bees.
Learn more about swarms and bee hives in hot weather at the monthly meeting of Backwards Beekeepers in Atwater, Sunday, July 24, 2011.