I've saw these around the yard last year. This morning I saw a large wasp in front of the hive. Glad I didn't use the wider entrance...they may not have kept it out. It took off before I could kill it. I think this is what I saw. Is it a threat to the hive?
(http://s21.postimg.org/3qu3as7vn/Chicada_Killer_Waspc.jpg) (http://postimg.org/image/3qu3as7vn/)
I have a lot of them in my yard. I've never seen them bother the bees.
I've captured a few hanging around on my pallets. Never saw them eating any bees yet.
I had to run home and figure out if they were a problem too.