Spiders should be looked for in the same way in grass, by creeping along on the ground or by sitting down and watching until something walks into view; or the grass and weeds may be swept with a cotton bag, fastened on a hoop like a dip net, with a short handle, and the spiders picked out with a dry bottle from among the leaves and insects that will be gathered with them. Bushes may be swept in the same way, or may be shaken over an open umbrella, or a piece of cloth or paper. In winter, when spiders are torpid, great numbers can be found by sifting the dead leaves that have been lying for some years in the woods. A common coal sieve is fine enough to hold the leaves while the spiders and sticks and dirt pass through, and may be picked over on a cloth or carried home in a bag and examined in the house. The sifting should be repeated several times, as many of the spiders hold to threads among the leaves and become loosened only after much shaking.
In the following pages a general description is given of each family, followed by descriptions of the species belonging to it, with a figure of each species placed as near as possible to the description. In some cases, where the genera are large and well defined, separate descriptions are given of each genus, but where the genus is not easy to distinguish or represented by only a few species, there is no separate generic description, and the species are placed next to those of other genera to which they are most closely related. If the names of spiders are known, they can readily be found by the index at the end of the book. If information is sought about an unknown spider, the illustrations through the book furnish the most convenient index, as the general form and proportions of spiders and the arrangement of their eyes usually show to what family they belong. The ground spiders and those without cobwebs are described first, and the sedentary species living in webs in the last half of the book. Readers unfamiliar with the subject are advised to read first the descriptions of the families and compare with them the spiders that they find in their own neighborhoods. The figures are in most cases enlarged for the sake of distinctness, and spiders of much smaller size must be looked for.