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Photo#178607
California Carpenter Bee - Xylocopa californica

California Carpenter Bee - Xylocopa californica
san diego, California, USA
it looked like a big fly or bee

Xylocopa californica
subspecies diamesa Hurd (if San Diego locality is correct)

Xylocopa
One of the Carpenter bees. I think there are a couple of species that can be or are black.

 
this bee is not black
the metasoma (abdomen) is blue

 
Ah not black
Thanks, I thought those were just reflections/highlights.

 
Yes
perhaps the Valley Carpenter Bee. Did you see any big golden ones flying around with it? Compare with these.

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