bee like flying insect
the other day I saw large black bumble bee like insects about 50-80 flying at grass level like they were individually searching for something after about an hour they were gone except a hand full they weren't swarming just flying close to grass level any idea
Huntingdon County Pennsylvania
There are a number of ground nesting bees in Pennsylvania. The physical description sounds like Andrena. You can read up on that at https://extension.umaine.edu/blueberries/2012/10/25/wild-bee-pollinators-the-genus-andrena/
Maybe the giant cicada killer? They will cruise the space above the turf. But they look more like a wasp or hornet. check out this fact sheet.
Any chance you can get me a picture.