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Show 1873] GENERA AND SPECIES OF ARANEIDEA. 115 traceable, though comprising the larger portion of the cephalothorax ; the lower margin of the clypeus is prominent at the middle. Towards the margin of the thoracic portion are some raised points or granulations, the lateral margins of the caput being also set with a single line of small prominent points. The eyes (four in number, pearly white and of large size) occupy the tubercular eminence which forms the apex of the cephalothorax ; they are contiguous, and form a crescent whose open side is behind : the two foremost eyes are considerably the largest. The legs are moderately strong, short, not very unequal in length, and furnished sparingly with hairs; their relative length appeared to be 1, 4, 2, 3. Terminal tarsal claws exist, but their number and exact construction could not be satisfactorily ascertained with the only optical instruments I possess. The palpi are short; radial and cubital joints short, the former strongest ; the digital joint is of a simple oval form, and appeared to have no concavity ; palpal organs very large, simple, and of a somewhat irregular pyriform shape, with a longish strong curved black tapering sharp-pointed spine projecting from their extremity. Falces moderately strong, of a somewhat conical form, pinched in at their extremities, which are furnished with a small curved fang ; each falx has a long, nearly perpendicular and slightly curved projection at its base ; this projection is equal in length to the rest of the falx. Maxillae, labium, and sternum (vide characters of the genus). Abdomen rather large, and projecting considerably over the thorax; it is of a regular oval form, somewhat flattened above, where it is completely encased in a sort of corneous shield : the sides are steep and covered with three longitudinal corneous folds ; these are separate from others, which are transverse on the hinder part, but follow the same linear direction as the lateral ones. The underside is two parts out of three covered by a larger corneous spiracular plate, near behind which the two apertures leading to the spiracles are visible ; and behind them again is another oblong transverse plate of the same nature ; near the lateral margins of these plates, and between them and the lower lateral corneous fold, is a single row of small rudimentary plates, looking like red-brown spots. The spinners are four in number, of equal length, and united in a kind of corneous case or sheath of a truncate-cone form, and placed under the end of the abdomen. A single adult male of this most remarkable little Spider was contained in a collection of Arachnida received from Ceylon from Mr. J. H . K . Thwaites in 1871. I have not been able to ascertain any thing as to its habits or habitat. Fam. PALPIMANIDES. Nov. gen. PACHYPUS. This genus is very nearly allied to Otiothops (Macleay, Ann. Nat. Hist., Sept. 1838, pl. ii. fig. 5) ; and but for the following differ- |