Description (from preserved specimen).

Length (excluding setae)—Ca., 12 mm.

Head—Large; sub-quadrangular, with slightly convex margins. Ground colour yellow, covered all over with fine sepia stipling, except on three small areas, one exterior to each ocellus. Eyes large, dark brown. Mouthparts of the typical Atalophlebid description. The median bay of the anterior edge of the labrum bears five prominent teeth.

Thorax—Yellow with sepia stipling: wing-pads cover the first two abdominal segments.

Abdomen—Very broad, narrowing considerably posteriorly: latero-posterior angles of segments six to nine project backwards as sharp teeth: the ninth and tenth segments are telescoped, the former, in particular, having a much narrower area visible than is usual in this genus. The ground colour is yellowish; heavy, symmetrical, dark markings, on each side of the median line, are found dorsally on the first nine segments: ventrally, the dark markings are placed in a median area on each of these segments and are suggestive of the same markings in Oniscigaster.

Caudal setae (broken)—Apparently ca. 12 mm.: yellow: whorls of very short, fine hairs occur at the joinings.

Legs—Colour dingy yellowish-brown (but markings possibly washed out by preservative).

The femora and tibiae of the middle pair of legs are somewhat longer than those of the anterior pair, but the tarsi are slightly shorter. The femora and tibiae of the posterior pair are longer than those of the other two pairs, the tarsi being about the same length as in the anterior pair.