Wasps don’t get much credit for pollinating flowers, but there’s no escaping the pollination-reach of Spotted Horse Mint (Monarda punctata) A Four-toothed Mason Wasp (Monobia quadridens), above, shows pollen on wings, thorax, and even some of the abdomen.
Great Black Digger Wasp (Sphex pensylvanicus). When I first saw one of these flitting rapidly between these flowers, I thought it was white on the thorax. But that’s all pollen.
Katydid Wasp (Sphex nudus). First I’ve seen. Great Black and Great Golden are much more common here.
Here’s a Great Golden Digger Wasp (Sphex ichneumoneus).
Backyard and Beyond 
Since I moved to NYC in 1980 I have seen exactly one katydid! What does a katydid wasp do in such a paucity of katydids? I assume they use what few they can find for egg laying and feeding larvae upon hatching, but how can such scarcity support a vital population?
They’re out there. Twenty species in NYC on iNaturalist https://www.inaturalist.org/observations?place_id=674&taxon_id=48124