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Show 420 MR. A. D. MICHAEL O N [June^3, Colour light yellow-brown. Texture polished. Cephalothorax almost conical, without special markings. Rostrum pointed; rostral hairs fine and long. Pseudostigmata at the base of the cephalothorax ; pseudo-stigmatic organs medium length, with short peduncles and rough pyriform heads. Lamellar blades on edge gradually increasing in width from the posterior to the anterior ends, provided with very short cusps. Lamellae joined by a trans-lamella not so wide as the lamellce. Interlamellar hairs upright, rather short. Lamellar hairs long and fine. Apodemata not joined to the sternum. Legs of the type usual in the genus, with fine hairs. Claws tridactyle, heterodactyle. Abdomen slightly pyriform, but very broad and short; with four longitudinal rows of extremely minute white hairs, and a few similar hairs on the hind margin, and a short hair on each side of the shoulder. Genital and anal plates rather square, with rounded corners; far apart. Algiers. DAM^TJS PATELLOIDES, n. sp. (Plate XXXVIII. fig. 3.) Average length about "66 millim. Average breadth about -42 millim. Average length of legs, 1st and 3rd pairs about "57 millim. ,, ,, 2nd pair about '46 millim. „ „ 4th pair about *68 millim. A species remarkable for the exceptional shape of the abdomen. Colour very dark brown. Texture smooth but not polished. Cephalothorax nearly as wide as the abdomen; without true sculpturings; but there is a vague ridge running transversely between the two pseudostigmata, this is not straight, but advances in the middle and curves backward to each pseudostigma. Rostrum rather small, pyramidal, almost sharp-pointed ; there are two pairs of rostral hairs, of which the hinder are the thicker. The cephalothorax widens greatly and suddenly behind the rostrum, the first pair of legs being attached at the side of the projection thus formed; then there is a slight indentation, and then a rounded lobe between the first and second pairs of legs. Pseudostigmata far apart, raised, cup-shaped, but with the outer side of the cup produced to a point. Pseudostigmatic organs long, rod-like, but slightly tapering. Interlamellar hairs short, rod-like, and placed quite close to the inner sides of the pseudostigmata. Legs not long for the genus, joints strongly clavate; peduncles of the femora not long and gradually thickening. One to four thick, somewhat curved hairs on each joint, mostly arranged in whorls : tarsi with one thick. straight hair on the outside, and numerous fine hairs. Claws monodactyle. Abdomen almost conical, with curved sides and a curved apex, it leans somewhat back; the dorsum has a great resemblance to the |