Your question intrigued me, so I started checking images and found very few were marked with gender. Pondering the point further, it dawned on me that a wasp dragging a caterpillar or digging a hole was indeed female. Evidently, it dawned earlier on a few astute contributors, so we do have several posts marked as female.

As to males, Eric Eaton provided this insight in one previous comment:

"Generally, I find the males have weaker reddish markings than females, are more slender, and lack a tarsal rake on the front legs."

Thank you Eric and Ron for your confirmation and comments. I'm new here, and have learned so much since my first post a month ago. I just wish I had more time and a better camera.

Your two most recent images are quite good, and all your posts have been fine for ID purposes. This is a great site to learn insects and photography, plus people-watch.