Adult male length 5-1/2 lines, length of cephalothorax 3 lines, breadth 2-1/2. The cephalothorax is of a short, broad-oval form, its length being only half a line greater than its breadth; it is flattened-convex above, and depressed near the margins, the _caput_ (when looked at in profile) scarcely rising above the level of the thorax. At the junction of the caput and thoracic segments is a deep, circularly-curved indentation, or fovea, the curve of which is directed backwards; the extremities of this indentation are continued obliquely forwards on either side, forming the normal ones which indicate the junction of the caput and thorax. Rather more than one-third of the distance between the above curved indentation and the fore margin of the caput is a very perceptible and deep but narrow, slightly curved, transverse indentation which divides the caput into two distinct parts; the curve of this indentation is directed forwards. The normal thoracic indentations are well marked, but not very strong; the surface of the thorax, though shining, appeared under a lens to be covered with fine rugulosities. Its colour is yellow-brown; a large triangular patch on either side of the caput being tinged with orange, and the rest suffused with dark brown. The caput is of a dark reddish yellow-brown, showing (in spirit of wine) two longitudinal bars, or strong lines, of a clearer orange yellow-brown colour; its surface is glossy, though, under a lens, the sides of the fore part are very finely striated or rugulose. These lines begin behind the extremities of the hinder row of eyes, and gradually converge to a point at the thoracic junction; the ocular region and central longitudinal line of the fore-segment of the caput have some long and very prominent black bristles. When alive, the cephalothorax appears to have been suffused with a purplish hue, corresponding to that of the abdomen and other parts. [Illustration: _Plate XX._] The _eyes_ form a rectangular figure, whose fore side is a little shorter than the hinder one, and whose transverse, or longest, diameter is as nearly as possible double the length of its shortest one; the eyes of the central or fore-central pair are small, and separated by a diameter's distance from each other. The hind laterals are the smallest of the eight, and each is almost contiguous to the hind-central nearest to it, this latter being of a sub-triangular form, and separated from the fore-central on its side by an interval equal to that which divides the two fore-centrals, but less than that which separates each fore-central from the fore-lateral on its side. Looked at as in two transverse rows of four each, those of the foremost row are darkish coloured, while those of the hinder row are pearly white. Omitting the eyes of the hind-central pair, the remaining three on either side form as nearly as possible an equilateral triangle.