False black widow spiders are small (up to 1/4 inch long), black, and have a red hourglass-shaped marking on their abdomen. They are most easily identified by their small size and their red hourglass-shaped marking.
The best way to get rid of false black widow spiders is to eliminate their food sources by thoroughly cleaning your kitchen and bathroom. You can also use commercial fly traps or bait. If you have a severe infestation, you may need to call a professional exterminator.