Pasipha backesi has an elongate body with parallel margins, known to reach up to 33 mm in length. The dorsum is a brown color, with a yellowish median stripe bordered by paramedian stripes ranging from dark brown to black in color. Though not usually visible to the naked eye, the ground color of the dorsum is a pale brown visible on the margins and anterior tip of the dorsum. Two dark brown lateral stripes are also present on the dorsum. The ventral side of the body is a greyish, pale yellow with a dark grey anterior tip.