This is only the second record of this species for NY. The first was seen in Central Park a few days earlier. Prior to these sightings, the farthest north this wasp was recorded was southern Delaware. Thanks to Dr. Matthias Buck for the ID and info.

Family Vespidae - Yellowjackets, Paper Wasps, and Hornets; Potter, Mason and Pollen Wasps
Subfamily Eumeninae - Potter and Mason Wasps
Genus Parancistrocerus
Species histrio - Parancistrocerus histrio