... at the University of Wyoming, he confirms this is Neoneurus. In fact, he might be able to ID it to species with a specimen that is in better shape, although it easily could be an undescribed species. He suggests the best way to find them is to search by nests of mound-building Formica ants. When the wasp is around, the agitation level of the ants rises - look in vegetation stems nearby. If you collect more wasps, get some specimens of the ants as well and store them in alcohol. (June is when they are most active). And I was wrong about the subfamily Neoneurine - that has now been downgraded to a tribe within Euphorinae.

So we sent a specimen of this species last year to Dr. Scott Shaw and he just got back to me and said it is one of the species he recently described.
Elasmosoma michaeli
Link to article

We are identifying insects from a bunch of pit traps out in the sage brush steppe, so more of this wasp may turn up. we've definitely collected a large volume of ants as well. Will definitely have to contact Dr. Shaw if we turn up some better specimens. Thank you!

We have found more, but the specimens were even worse. It's a good sign that more might turn up later though. Will keep looking.