Chalcidoid Wasp
Genus Leucopsis

tiny wasp
This was a very tiny wasp and I'd never seen one like it before.  I guess they're not
 that common. I had a heck of a time photographing it in my yard in Taylorsville, Utah, 
but I finally got two bad shots of it before it took off.  Carol Davis, 7-25-2010

It had a very funny-shaped abdomen - not like an abdomen you would normally
 see on a wasp. Usually the back end tapers off but this one got larger and more
rounded. Wasp larva in the Leucospidae family are parasites of other bees and
  Eric Eaton has a good article on them here.  Carol Davis, 7-25-2010

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