A. mellipes.

I was wondering what detail in the other linked image (with the blue background) showed Auplopus mellipes mellipes vs. this Auplopus mellipes? Coloring, shape, size...? I'm just curious if the wasps were different or if there was some detail I should have been more aware of when I was photographing. Just trying to learn, thanks.

I just didn't specify for this image. They are both A. mellipes mellipes. One of the other subspecies, common in my area, is A. m. variitarsus. It has mainly gray or black legs instead of red or orange. They're just subspecies designations anyway. The most important fact is that they are A. mellipes, since the species is the fundamental unit of evolution, not subspecies. Subspecies in spider wasps are little more than geographically distinct color forms.

I thought I might have missed photographing detail required in the image. I moved just to keep them together (since we have the subspecies page). I forgot to ask if you can determine gender?

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I assume from your comment I wasn't too far off, so I moved somewhere closer and more likely to be seen.