Looks like you killed a cicada killer to me.
Thanks is it a threat to my bees? thanks guys, EdYes...It it a cicada killer. They are solitary ground dwellers.
Thanks again, I found thios PDF also, EdI wouldn't think so...here is a decent read. I have very, very little experience with them, so you may want to do some more research. Maybe somebody else will chime in.
http://www2.ca.uky.edu/entomology/entfacts/ef004.asp
I used to be concerened about Mud Dobbers, too. They're pretty intimidating looking, but after seeing them pluck unwanted worms off my cucumber and tomato plants, I have embraced them, too. Never seen either species near any of my hives.