Spiders live in all kinds of places. Certain species are attached to houses and seldom found far from them, and many of these occur over a large part of the world. The light webs in the corners of rooms are chiefly the work of _Theridium tepidariorum_ (p. 112), occasionally of _Steatoda borealis_ (p. 119) and _Steatoda triangulosa_ (p. 121). In cellars the thin webs about the stairs and shelves are those of the long-legged _Pholcus phalangioides_ (p. 129) or of _Linyphia nebulosa_ or _minuta_ (pp. 144, 145), and the thick flat webs in corners and between the beams are those of _Tegenaria derhamii_ (p. 96). On the outside of houses live two jumping spiders, the most common being _Epiblemum scenicum_ (p. 60), a small gray species the color of weathered wood, and the other, _Marptusa familiaris_ (p. 61). Some of the round-web spiders live in great numbers about houses. The three brown species, _Epeira sclopetaria_ (p. 160), _patagiata_, and _strix_, hide in cracks and at night make their round webs in porches, barns, and bridges. In the northern part of the country _Epeira cinerea_ (p. 165) has the same habit. _Epeira globosa_ (p. 174) is often found on the outside of houses, and so are _Zilla atrica_ and _Zilla x-notata_ (p. 185). _Amaurobius ferox_ (p. 215), a large imported species, is sometimes found in cellars, and several Dictyna (p. 206) live in great numbers on the outside of houses, in corners of windows, under the edges of shingles, or in cracks of walls, spreading their webs wherever there is room for them and gathering dust so that they often make a distinct spot on the wall. In the southern states _Filistata hibernalis_ (p. 220) is one of the most common spiders about houses. Its webs often make a round spot of dust a foot or more in diameter. Stones and sticks lying on the ground furnish shelter for a great number of spiders. _Steatoda borealis_ (p. 119), _marmorata_ (p. 121), and _guttata_ (p. 120) and _Asagena americana_ (p. 122) are found in such places, and so, especially in the South, is _Latrodectus mactans_ (p. 122). The large jumping spiders, _Phidippus mystaceus_ (p. 50) and _tripunctatus_ (p. 51), make large nests of white silk under stones near the ground. The ground spiders, _Drassus saccatus_ (p. 6), _Gnaphosa conspersa_ (p. 2), and _Prosthesima atra_ (p. 5), run on the ground and hide under stones. _Lycosa nidicola_ (p. 69), _Lycosa communis_ (p. 75), _Lycosa pratensis_ (p. 69), _polita_ (p. 70), and _cinerea_ (p. 74) are often found under shelters of this kind. The crab spiders of the genus Xysticus live under stones, but oftener under bark farther from the ground.