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Show 562 REV. O. P. CAMBRIDGE ON EGYPTIAN Sl'IDERS. [June 20, above markings, there are four pale transverse wavy lines, which cross the whole of the upperside of the abdomen, the two foremost, - however, being interrupted by the longitudinal black marking; the sides of the abdomen are marked, but not regularly, with blackish brown spots and small markings, some of them assuming an oblique direction ; but none of the lateral markings extend far down towards the underside, which is (as are also the sternum, maxillae, and labium) of a plain yellowish hue devoid of markings. The long spinners of the superior pair are dull yellow faintly marked or annulated with yellowish brown, or sometimes with brownish black. The description given by Walckenaer and Lucas from Savigny (I am unfortunately unable to give it from Savigny's work itself) is:- " Roux; le corselet marque de deux bandes dorsales brunes, et borde de taches de la meme couleur. Abdomen varie sur le milieu de deux rangees contigues de taches cannelees brunes, et sur les cotes, de traits bruns obliques." The quickness of the movements of this spider, which, until disturbed, lies motionless, with its legs flat and extended in all directions over and round the trunks of the trees, is astonishing, and rendered its capture, at first, very difficult; after a little practice, however, I obtained it more easily by dexterously flicking it off the tree with a twig into an entomological net held underneath. This was the first Spider that I had seen in Egypt; and it was thus invested with a peculiar interest, being also so unlike any thing European that I had before met with. Neither sex appears as yet to have been found in the adult state; and in fact I saw, and captured, only females, aud all those immature. Walckenaer does not state whether the example (also a female) described by Savigny was adult or immature. It does not appear to have been before noted that the subdivision of the metatarsi (on which the separation of Hersilia from Hersilidia is chiefly based) only occurs in respect to the legs of the first, second, and fourth pairs, the short third pair having the usual number of joints, with an undivided metatarsus. It is singular that M . Lucas, who has gone so minutely into the structure of the legs of Hersilia, should not have noticed this point. Gen. HERSILIDIA, Sim. H E R S I L I D I A LUCASII, sp. n. (Plate LVIII. fig. 5.) Adult male, length 2\ lines. The whole of the fore part of this Spider, whose general form closely resembles other species of the genus, is of a pale yellow colour, the cephalothorax, palpi, and legs being covered with a fine grey pubescence ; the cephalothorax has a dusky brown margin; and an indistinct line of the same hue runs backwards from each eye of the hind central pair, meeting and terminating at the normal indentation which marks the union of the caput and thorax ; the hinder slope has also a central longitudinal brown line. The eyes are in the usual position ; the four central ones form a |