PBRd, West Newbury, MA
https://www.inaturalist.org/observations/239679847
"Parasitica" - Parasitoid Wasps)
Superfamily Cynipoidea
Family Cynipidae (Gall Wasps)
Tribe Cynipini (Oak Gall Wasps)
Genus Andricus
Species nigricens (Andricus nigricens)