I'll soon be submitting the first draft of an article to BugGuide on identifying spider wasps, both in the hand and in the field/by photograph. I just wanted to add some thoughts on this particular wasp. I was glad to see possible up there attached to the A. cleora. The stuff about that wasp was just an example, personally I wouldn't even try to identify an all black Anoplius unless there were several photos and they were taken from a camera attached to a microscope. This genus has 38 species recorded from east of the Mississippi River and many of the males are all black. In many cases it also takes careful study of the male genitalia to make a positive ID. I hope I didn't mislead anyone in my first comment. Actually this wasp reminds me of Anoplius lepidus atramentarius (conjecture only) and very little of A. cleora (A. cleora is a really "hairy" fella).

And a worn one at that! Look at the wing wear, it's tattered all the way to the third discal cell. This appears to be a male (I put the photo on my computer and enlarged it...I thought I counted thirteen antennal segments (females only have twelve). Also, the head looks rather small in proportion to the rest of the body. I have observed intense male-male competition in Anoplius cleora and there is well documented competition in Hemipepsis. This competition is probably why this guy's wings are so worn.

I think this is a Spider wasp, Pompilidae. Look at the head. the shiny thorax, and the short petiolus. And Sphex is bigger..