Crabronidae.
http://en.wikipedia.org/wiki/Crabronidae
I know that it is difficult to see, but the best character to separate the bulk of the large wasps (Vespoidea: Pompilidae, Vespidae, Tiphiidae, Scoliidae, etc) from the Apoidea (bees, Sphecidae, Crabronidae) is the shape of the pronotum.
This page illustrates the difference.
http://www.myrmecos.net/2013/10/07/how-to-recognize-apoidea/
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