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I didn't know you had Ectemnius continuus. I have seen it a few times in USA. This does look similar. Among North American species, according to an expert in the group, it is distinguished from most by the all-black third tergite and from all by a "small inner process on the second tarsomere of the male mid tarsus".

On BugGuide subfamily Crabroninae is named "square-headed wasps". http://bugguide.n...520/bgpage