on dolomite prairie outcrop (east-facing side if I recall)
Limestone prairie outcrop
2019 these photos are really not the best I have way better photos around.
I included some not so sharp photos because they revealed the top of the abdomen better. Cloudy day with wind blowing at 10x magnification to keep my distance made it tough to get sharp photos.
On calcareous sandstone in oak woods on the margin of a bluff prairie
Dark underside, on fallen bark along a seepy, north facing sandstone cliff
One of the biggest bumble bees I've seen or an amazing mimic. Would love to know the species. These bees love my lavender plants.
On boneset, Eupatorium perfoliatum