Uh oh, the cicada won't fit!
The cicada killer is a solitary nester, but ideal nesting conditions may create a seeming "colony" of these giant wasps (which do sting!). Like many evolved predator-prey relationships, the Cicada Killer mates at the same time of the summer when Cicada nymphs are transforming into flying adults. The female Cicada Killer does all the hunting. When a cicada is located, the wasp stings it to paralyze it, and then carries it (flying) back to its nest. The cicada is never killed, but instead is kept as a living host for the eggs of the Cicada Killer. The Cicada Killer places male and female eggs at different locations along the cicada's body (favoring female eggs). The eggs hatch and eat away at the living Cicada, which is periodically paralyzed by additional stings from the adult female Cicada Killer.
There it goes! Yum!
Ironically enough, Cicada Killers are also the hosts to a number of species of parasitic flies, who lay eggs on the wasp's body and wait for the maggots to tear into the Cicada Killer.
I looked at a couple of websites for instructions on "managing" Cicada Killers (since they are generally considered a beneficial species), and found some great tips on (generally) providing habitat for ground-nesting bees and wasps, particularly by leaving slopes of sandy soil exposed. Of course, this would also include yellowjackets....but we'll leave all of that for another post.
Post-script: that post can be found here.