Male and female both have a bi-coloured pterostigma on each of the front wings.
Male: always has a light-blue spot at the “tail” (segment 8), blue ante-humeral stripes on the thorax and blue eyes.
Female: varies with at least 5 different colour forms. The thoracic markings and the tail spot are violet in the immature form violacea, but salmon pink thorax and blue spot in the form rufescens. When mature the female may be blue (like the male) in the form typica, olive green thorax and brown spot in the form infuscans or pale brown thorax and brown spot in the form infuscans-obseleta.