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Show 620 REV. O. P. CAMBRIDGE ON EGYPTIAN SPIDERS. [June 20, ated, in a longitudinal direction with brown; and the underside is dull pale yellow, marked with a longitudinal central dark brown stripe, on each side of which, towards the margins, is a finer line of the same colour ; these lines converge towards the spinners, which are rather long and prominent; those of the superior pair are pale yellow, black on the uppersides, the inferior pair being of a brighter yellow. The adult female measures about 4| lines in length, but differs very greatly in colours and markings from the male, though in general structure and form the sexes are much more nearly alike. The female has the sides of the cephalothorax yellow, deepening to a dark striated brown above, the caput black, clothed with fine pale hairs, and some long white ones on the clypeus ; the two horn-like tufts of black bristles below and behind the lateral eyes of the anterior row are generally better defined than in the male. The legs are yellow ; those of the first pair tinged with orange-brown ; these last are much the strongest, though not so disproportionately strong as in the male ; they are scarcely longer, if so long as those of the fourth pair, the second pair being perhaps a little the shortest. The palpi are short, slender, yellow, semiannu-lated with black. The abdomen is much longer in proportion than that of the male, being considerably more than double the length of the cephalothorax; its general colour is pale yellow, the upperside dark blackish brown, with a broadish, longitudinal, pale-yellowish, central, slightly dentated baud, spotted sparingly with small black spots, and bisected longitudinally by a black line ; the sides are very sparingly marked with brown; and the underside has seldom more than a fragment or two of the brown stripe and lines on that of the male. Adult males, together with an adult and immature females, were found among rushes and herbage in a marsh near Alexandria. It is a very striking-looking Spider, allied to Attus staintonii, Cambr., and belongs lo a group which has, as yet, no known representatives in Europe. From various points in its form and structure, it seems entitled to rank as generically distinct from the typical Atti; it appears indeed very similar in form to some species of the exotic genus Mavia, C. Koch ; but at present, not possessing any type of Mavia, I am not able to determine whether or not it is identical in form and structure with the typical species of that genus. Gen. YLLENUS, Thor. Y L L E N U S SALIENS, sp. n. (Plate L X . fig. 92.) Adult male, length 1-| line; adult female, 1* to 2 lines. This minute but pretty little Spider is in general colours and markings very much like Attus bonnetii, Sav. (described above p. 611); it is, however, much smaller and generally of a brighter colour ; the legs differ in length; and the palpi and palpal organs are very different in their form and structure. The cephalothorax of the male, which is very massive, is of an |