Caterpillar Hunter beetle
I was so agog at this big black beetle with electric blue trim that I nearly didn't get any photo of it at all. He was trundling across the path and I just stood there gaping until he had almost disappeared into the grass at the edge. I wish the photo was better. I'm posting it so I can show a friend who also found one of these cool beetles. Calosoma externum (I think), Carabidae. Central IL, Summer 2010.