This chart is designed to help with quick identification of spiders that are Color: Adult females are glossy black with a variable number of red markings on the top and bottom of abdomen. Adults males are similar, but with a few white markings. abdomen and legs are uniformly colored with no stripes, bands, or mottling. Female zebra spiders are 5–9 mm long, while males are 5–6 mm. Male zebra spiders also have distinctly larger chelicerae than females. These small spiders are black with white hairs that form s: S. scenicus.