The milkweed is blooming along the roadside. As best as I can tell, this butterfly is called a Question Mark. It's underside was dark, dark brown .... almost black ... and looked a lot like a bit of burned ash. I love the scalloped leaf shape of the wings!
@aikiuser@vankrey I was curious about those flies too. I went back in the evening ... they are all dead! Milkweed is where Monarch butterflies lay their eggs and are an essential part to the Monarch life cycle. As is nature's way, flies like to eat Monarch eggs ... but they are fatal to the flies! I am wondering if that's what happened here. I do hope some eggs survived.