Scientific Name: Physocephala tibialis
Family: Conopidae
Native Range: East United States, Pennsylvania*
Size: I observed them to be about 25 mm (1 in)
Active: July – August
Color and Appearance: “Adult body mostly black, with thin white, posterior bands on abdominal segments one and two; tibiae whitish at base.”*
Common Eastern Physocephala Wasps are flies that parasitize bees. They station themselves near flowers where they can find victims.*
*From Wikipedia (https://en.wikipedia.org/wiki/Physocephala_tibialis)
Common Eastern Physocephala Wasp on Mountain Mint 
Common Eastern Physocephala Wasp on Mountain Mint