What kind of insect is this?

I saw an insect that I have never seen before. I have lived in this area for about 40 years and this was a first. It loomed like a stretched out bumblebee! Almost like a mix of a bumblebee and a hornet! It's back (or thorax) was hairy, it had a bee or wasp type head, but it abdomen was the strange thing. The abdomen started out long but then flattened out to resemble a shrimp's tail! Coloration was like a bumblebee. The wingswere extremely long, possibly at least an inch per wing. Wheni saw this insect it was going from flower to flower. Every now and then itwould fly at me, as if warning me to stay back. Any ideas on what species this is? I live in Northern Kentucky.