TX has about 100 different varieties of wasp, and I think that is only a slight exaggeration. I had never seen so many different types before I moved here.
Our water tanks are a great attraction for them this time of year, they come in by the dozens to drink. And drown. You have the chance to get a good look at all the different types.
Generally they like to nest under the eaves of buildings or anywhere they can get their nests up out of the rain.
We also have these here, this is a small one though -
http://www.rock.uwc.edu/facultypages/tklubert/images/Originals/CicadaKiller.jpg
I was in my garage once, not long after I moved here. I had the door open and my back to it, working at my workbench. I heard a low pitched humming, but couldn't locate the source. It went away, I went back to my work.
I soon heard it again, though. I turned around and stood very still, just looking. A VERY LARGE WASP (or very tiny helicopter, your choice) was slowly flying along the seams in the concrete floor, about six inches off the floor. It flew along the seam, then up the side of the door in a very machinelike way, obviously looking at the cracks.
I couldn't believe my eyes. I walked over to the insect and knelt down, looking at it. It acted like I wasn't there, so I got a little closer. The humming was quite loud, and I could feel the draft from its wings on my legs.
Suddenly it noticed me and left its business. It flew up and hovered about two feet in front of my face, looking at me like I was looking at it, except it had a humongous stinger which slowly extended, contracted, extended, contracted. Then it decided I wasn't good to eat, and went back about its business. It finally flew away.
I went in and cleaned my shorts. It was a cicada killer, and without exaggeration, it was the length of my thumb, and only a bit thinner. HD, the wasp trying to kill your hummingbird were probably cicada killers, as that is what these giant wasps collect, and lay their eggs on. Probably thought the hummer was a cicada.
Here's another site with pics. These are life sized.
http://whatsthatbug.com/killerwasps.html
Andy