not a great fan of wasps and bees soi vote for these and if u got kids get the experts in , i crapped myself when i saw the pix of the wasp on the hand :S
That's one of those Japanese Hornets I believe. They can spit acid you know. And that acid has a pheremone which attracts all other hornets in the area to you.
I think something like 60 people die in Tokyo alone every year to hornet attacks.