The Common False Widow Spider, Steatoda bipunctata, is a regular species in or on buildings and gardens. The female (pictured) is a shiny chestnut brown. It is a small spider, up to 7 mm, with two black spots on top of the abdomen which give it its specific name. It is also known as Rabbit Hutch spider. The male has a much smaller abdomen. It is unrelated to the Widow Spider and not particularly venomous. We found this female in the folds of the cover of a tarpaulin outside, but I have found this species on the dry underside of logs, waterbut covers and window frames. Mature specimens are found all year round, surrounded by a web made up of a tangle of silk threads, some of which are sticky and held under tension so that struggling insects might break them and dangle from them. Males stridulate during courtship making an audible sound using a series of ridges in the abdomen which rub against teeth to the front of the caparace. Although native from Europe, the species was introduced in North America in the early 20th century and outcompetes the closely related species S. borealis.
Martin Nyffeler, C. D. Dondale, J. H. Redner (1986) Evidence for displacement of a North American spider, Steatoda borealis (Hentz), by the European species S. bipunctata (Linnaeus) (Araneae: Theridiidae). Canadian Journal of Zoology, 1986, 64(4): 867-874, 10.1139/z86-130.