Got these wasps on golden rod this weekend. I have seen these around but this is the first clear shot them mating that I have been able to get. They will stay coupled for quite some time and fly from flower to flower while mating. Originally I thought these were Ichneumonids but are Sphecids. Tip O' the Antennae to James Trager for correcting this.
Update! Got an ID from Bugguide as Eremnophila aureonotata. What is it about having a name that is so important for us? Granted the comunication function, but there is that sense of the name giving us control over something or at least a sense of control. But people do confuse naming with explaining.