I’ve found many Sitticus fasciger at this site but I’ve never seen one marked like this. I suspect it is a female of the same species as the male in the thumbnail below.

Although found on different days, the two spiders were located within the same ~10 feet stretch of wall and I found 3 more of the same species the day after I found this one. Unlike S. fasciger which favors the concrete itself, I found all 5 of these spiders on a whitish rubber-like strip of caulking between concrete slabs as if they favored that background. Weird.

I suspect these spiders are S. ammophilus by comparison to the guide’s photos of males and Dr. Maddison’s photos of both sexes (found here).

Although, I think I have the ID right, I’d really appreciate some help with this one. Thanks in advance

the male