Phidippus regius, known commonly as the regal jumping spider, is the largest species of jumping spider in eastern North America. Adult males range from 6 to 18 mm (0.24–0.71 in) in body length and average 12 mm (0.47 in). Females range from 7 to 22 mm (0.28–0.87 in) and average 15 mm (0.59 in). P. octopunctatus from western North America reaches a larger size. Males and females are easily differentiated. The males are always black with a pattern of white spots and stripes. Females often bear similar patterns to the males, but range in color from shades of gray to a vivid orange.