Chrysis angolensis.
Photo: 07/28/18.

Native to the Old World, where it is widespread, this cuckoo wasp species arrived in the US probably during World War II. Like other wasps in this family, it lays eggs in the nests of unrelated host species. C. angolensis specifically parasitizes the mud nests of Sceliphron caementarium which I posted here.  

bug guide (these photos):