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This is probably the most abundant of house spiders in the southwestern United States. Full grown they are 3 mm or less in length ... too small to bite through human skin. Their webs are positioned in corners and along window sills where they catch minute crawling or flying insects. The webs readily gather dust and are the bane of fastidiuous housekeepers. The can also be found on outside walls and on surfaces of boulders in more natural habitats.
I think the first is a male and the second is a female of the same species. The second I caught dancing around the moth and wrapping it for dinner. Can't call these porch light visitors, they're the greeters for the visitors. I would say that the bodies are about 1/4 of an inch.