Numbers
89 species according to Borror and DeLong.
(1)Identification
Hump-backed large crickets with long antennae and very long legs. Wingless (and thus unable to chirp) up to about 25mm (1 inch) long. Able to jump several feet, which can be startling. Light tan to dark brown in color.
Habitat
Cool damp places - caves, rotten logs, under leaves or rocks. Will not reproduce indoors unless they find continuous dark, moist conditions.
Food
Feed on leaf debris. In houses may chew on paper products, occasionally fabric.
Remarks
If these occur in a house the best treatment is to remove them and their breeding habitat - cool moist dark places such as piles of logs or boards in basements. A clean dry home will not be a welcoming place for these guys. Although they are scary-looking they are basically harmless to humans, except perhaps for minor damage to stored items, and are easily discouraged by eliminating the dark damp habitat they prefer.
Internet References
Clemson University Click on the image to get to a very informative fact sheet.