American house spider Parasteatoda tepidariorum. (Listed as Achaearanea tepidariorum in many sources. It is unclear to me which is more proper to contemporary spider taxonomists.)
Spiders find houses to be such good hunting grounds that there are numerous species that get to be called "house spiders." Many are European species that were associated with buildings early in human history. This species appears to be native to South America, but is now found in houses throughout North America and around the world. This little cobweb-builder is responsible for many of the dusty webs in corners of kitchens, under shelves and chairs, and other places visited more by insects than by human hands.