A mason wasp, Ancistrocerus unifasciatus.  These wasps seem to be nesting above my window, and they periodically find their way into my room, where I have to transport them back outside.  They are not social but nest near others of their kind.  There is not much information on this species, but it seems that adult mason wasps in general harvest nectar from flowers, while eggs and larvae are provisioned with paralyzed caterpillars, beetle larvae, and other such live meat. 


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