I believe this excellent digging beast may be a Stictiella species. Likely S. formosa. This is solely based on the fact that I know what went into this hole that she has almost finished covering up. It was a fine male Fiery Skipper. And she held it with its belly up, wings flaring on either side of her. I have this as the only likely genus of wasp in Arkansas that would be taking adult Hesperidae (Grass Skippers). I may learn differently. If some expert is out there please let me know.

From Calico Rock where Cheryl and Norm found a small colony of these butterfly eaters. Again the same Stictiella species. Putting Sachems in the ground as fast as they could catch them. I think the dorsal markings on this wasp are distinctive, but I reserve judgment until I see the other Stictiella species in the east.

I think this is a Microbembix species. Taken on the beach at Holla Bend with many others in the area. Have a specimen to verify. Interesting Sphecids that take parts of insects like pack rats instead of the fresh whole.

This digger is large. I stumbled on this colony of Stictia carolina in 2004 and checked it again in 2005. Even bigger then and I finally got one to stop near the mouth of its lair. I never could get one with a kill. This is a hunting wasp that takes horse flies. They are known as Horse guards because of this. They will stick closely to their horse (or cow or human) and grab the Tabanids that irritate them. I notice these all over Holla Bend now. They occasionally zoom up to me to have a look.

A better shot of another female in 2008. Same Holla Bend colony. She was throwing sand and tending her burrow. I think the males lack that thorax side stripe now that I compare. Impressive animals.

This is the male Stictia carolina. The colony of Stictia in 2008 was the most active ever. Males were doing tight territorial battle in centralized areas with the females flying back and forth to their peripheral sand digging spots. I sat in the sand and shot this one repeatedly to try for a clear shot. Note the reduced white on the male and those terminal structures including the plate with a double white spot on it.

Compare with this smaller species of Bicyrtes. Also a sand lover. But these take stinkbug species. It is about one half the size of the above Stictia. There were no Stictia in the Toadsuck area and this Bicyrtes has only loose associations there. No dense colonies.

And another Bicyrtes in Stone county carrying her stinkbug into sand. Amazingly this sand was a small patch for a horseshoe pit in the middle of an Ozark valley. Many Bicyrtes were coming to these two square patches.

Same female closing her diggings with the stinkbug tucked away.

And this basic pattern must be dominant through the Bembecines. This is a Bembecinus. I know this because I took one and I saw them provisioning with leafhoppers at Holla Bend. Convergent lower eye margins and a ridged propodeum. I have only two species likely in AR: B. nanus and B. neglectus. I don't know which this is yet. These had a loose colony on a sandy road. The leafhopper was a light greenish species. Saw several going in.

And a cleaner shot from a higher angle at the same colony (different individual). 

And in Woodruff county, Bo and I found a colony of these guys in some sandy soil in the Cache river bottomlands. This is a Glenostictia. A wasp that uses Bombylid flies. There were several species of Bombylid around. We watched for one carrying a fly but never saw it. There were many open holes in the sand.  
And virtually the only shot I have taken of a Cerceris. Large genus of beetle hunters. Probably 20 or more species in AR. Difficult from photos without deep experience in the group and multiple shots. I have never seen one carrying prey.

An unknown pollen-dusted Sphecid in fall. Possibly an Isodontia species according to Eric Eaton.

Wasp handiwork. Likely an Isodontia (we have four species), one of the stick or tube nesting species. If so, the bamboo has been filled with alternating chambers containing Katydids with an egg attached. The spaces between chambers are made of mud usually. The wasp cuts and plugs the hollow tube with grass stems as you see here.

Wasp and Katydid. This may be another Isodontia species (this is their selected prey). This one was flying with this large kill (you can see it extends well beyond the wasp abdomen). Stopped for a breather. Note the nice reddish hind tibiae and tarsi. This may be Isodontia auripes. Not sure.