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Show 1901.] REV. O. PICKARD-CAMBRIDGE ON EXOTIC SPIDERS. 11 2. On some new and interesting Exotic Spiders collected Messrs. G. A. K. Marshall and R. Shelford. By the Rev. OCTAVIUS PICKARD-CAMBRIDGE, M . A V F.R.S., &c. [Received December 6, 1900.] (Plate V.1) Order ARANEIDEA. Earn. D R A s s i D .E. Gen. PROSTHESIMA L. Koch. PEOSTHESIMA ALBOMACULATA, sp. n. (Plate V. figs. 2-2 c.) Adult female, length 2^ lines (4*5 mm.). Cephalothorax flatfish, oval, truncate at each end, fore end rather the narrowest, lateral marginal impressions at caput very slight, profile-line nearly level. Colour deep black-brown, softening to yellowish brown round the thoracic indentation; surface thinly covered with grey adpressed hairs. Eyes in two transverse rows of very nearly equal length. Curve of posterior row slight and its convexity directed backwards. Anterior row almost straight, laterals of this row largest of the eight, the two centrals being placed on a slight prominence, and further from each other than from the laterals. The two centrals of the posterior row are much further from each other than from the laterals and are slightly the lai'gest. The four centrals form a quadrangle as long as broad, the fore side being shortest. Legs moderate in length and strength, 4, 1, 2, 3. Colour yellow to yellow-brown ; the tibiae, femora, and genuae of the first pair black-brown, these joints of the second pair yellow-brown, and of the third and fourth pairs more or less deeply marked longitudinally and suffused with black and brown, furnished with coarse hairs and spines, the latter most numerous and strongest on the tibiae and metatarsi of the third and fourth pairs. Falces, maxillce, and labium deep brown. Sternum oval, pointed behind ; colour reddish yellow-brown. Abdomen oval, somewhat flattened, black, with four conspicuous white spots forming a quadrangle on the fore half of the upperside, the two hinder spots largest and nearly round, the anterior, near the fore margin, oval or subtriangular and forming a shorter transverse line than the hinder spots. On each side of the underside, about the middle, is a large somewhat irregular triangular-shaped white patch, whose inner angles are nearly contiguous a little way behind the middle. Spinners of the inferior pair much wider apart than the superiors. Genital aperture simple but characteristic in form. Hab. Salisbury, Mashonaland, S. Africa, 5000 feet, Nov. 1898 to Jan. 1899 (G. A. K. Marshall). 1 For an explanation of the Plate, see p. 16. |