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Show 596 REV. O. P. CAMBRIDGE ON EGYPTIAN SPIDERS. [June 20, dinary marking ; the ground-colour of the abdomen deepens in its hue on each side of this white stripe, becoming of the same colour as the lateral stripes at its hinder extremity ; the underside is pale huffish yellow, marked with two longitudinal brownish lines, which converge a little towards each other as they get near the spinners. An adult female differed only in being of a darker and more suffused hue, the different lines aud markings being not quite so vivid. An adult example of each sex, with an immature female, were found on the branches of the sont acacia, during the ascent of the Nile, between Cairo and Manfaloot. Fam. LYCOSIDES. N I L U S , gen. nov. Cephalothorax short, broad, and with very slight lateral constrictions at the caput. Eyes not very large nor very unequal in size, occupying the whole width of the upperside of the caput, in two not very widely separated, and almost equally curved, transverse rows ; the convexity of the curves is directed forwards, but the front row is the shortest. Legs tolerably strong, not very long nor very unequal in length; their relative length 4, 1, 2, 3, or 1, 4, 2, 3 ; each tarsus ends with three curved claws. Maxilla moderately long, straight, broader at their extremity than at their base, and rather roundly truncated. Labium short, scarcely half the length of the maxillae; lateral margins slightly curved, and apex rounded, Abdomen short, oval, rather pointed behind, and projecting considerably over the base of the cephalothorax. NILUS CURTUS, sp.n. (Plate LX. fig. 13.) Immature female, length rather more than 2 lines. The cephalothorax has a rather abrupt hinder slope, and the profile-line of the caput and thorax to the hinder slope is level; its colour is yellow-brown, the ocular area, including a large somewhat quadrate area behind it, being yellow, the quadrate area having two indistinct brownish patches near its hinder part; the clypeus is yellow, with two brown patches opposite the middle of the base of the falces, and its height scarcely equals half that of the facial space ; on each side of the cephalothorax is a well-defined, straight, yellow, but not very broad stripe, reaching from the hinder extremity quite to the insertion of the falces, and below it is a broad yellow-brown marginal band. The eyes are seated, in the form of a crescent, on largish black tuberculate spots ; the lateral eyes of the hinder row are the largest, and the fore laterals the smallest of the eight; the interval between those of the hind central pair is rather less than that between each and the hind lateral on its side; while the interval between those of the fore central pair is rather greater than that between each and the fore |