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Agapostemon sp.
Metallic green sweat bee with some bluish tint
Palm flowers in a suburban yard
Good point -- just because your other spotting was Agapostemon doesn't mean that this one necessarily is. Maybe this would be helpful http://people.virginia.edu/~thr8z/Bee_Di...
I'm not sure this is an Agapostemon, this could be also Augochlora and Augochlorella. I think you should keep your ID to family (Halictidae)
I read that only females can have a green abdomen as well as head and thorax.