Only one species, I. bicolor, will be described as all others are very similar in appearance. Nymphs are large and streamlined and have three tails, the middle one fringed on both sides and the lateral ones on the inner margins only. Thick fringes of hair are borne on the inner side of the forelegs, while the fore tibia bears a conspicuous spine. Adults are usually reddish-brown to purplish-brown in color, with the forelegs being brown and the middle and hind legs being pale or whitish.
