Once had an infestation at my place near Springtown. Looked the same. Cicada killers. Borrows all over the yard. Hundreds, maybe thousands of them. Totally harmless, according to Soozy's uncle, who taught entomology on a university level. Females do have a wicked stinger and potent venom. They sting cicadas, crawl over them, grab hold, and fly the cicadas back to the borrow. Then eggs are laid inside the stunned cicadas, and when the eggs hatch, the babies eat the cicadas. Note, the females have stingers and venom, but are totally nonaggressive. Males are very territorial but lack any form of weaponry to back up there threatening behaviors--all buzz and no sting. Once I found out how harmless I merely wandered about amongst them, just to blow ignorant people's minds. They did a nice job loosening the hard dry soils in the yard and allowed significant penetration when raining or watering. Anywho, if they really bother you a badminton or tennis racket makes short work of them.
Just a note, when cicada killers fill the skies watch where you step--lots of Texas is home to brown tarantulas who wander the ground seeking mates at the same time. Don't worry, they are not really aggressive towards humans, and not all that big, only 4-6 inches across the toes. They do have fangs and venom but are not aggressive unless you pester them. Feels about like a bee sting, not nearly as bad as rearending a female cicada killer at 45mph.