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Show 564 REV. O. P. CAMBRIDGE ON EGYPTIAN SPIDERS. [June 20, yellow mottled colour of which the colour of the Spider so admirably agrees that it requires a practised eye to detect it; and in fact its movement is generally the first cause of its detection. Its specific name is conferred in compliment to M . H. Lucas, of the Jardin des Plantes, Paris, to whom we are indebted for descriptions and figures of so many North-African Spiders. Fam. SCYTODIDES. Gen. LOXOSCELIS, Heinek. et Lowe. LOXOSCELIS RUFESCENS. Loxoscelis rufescens, Duf. An. Sc. Phys. t. v. p. 203, pl. 76. Scytodes rufescens, Sav. Egypte, pl. v. fig. 2. Adult and immature females of this Spider were found among the ruins of an old mud wall near Cairo, and an immature male in a similar situation at Alexandria. Gen. SCYTODES. SCYTODES THORACICA. Scytodes thoracica, Walck. Ins. Apt. i. p. 271. An immature female of a Spider which is probably only a variety of this species, was found in an old building at Cairo. The only apparent difference between this example and the typical S. thoracica consists in the very faintly marked cephalothorax, the abdomen marked only with two converging rows of black spots on the hinder half, and the legs wholly immaculate. The discovery, however, of adult examples may possibly prove it to be of a distinct though closely allied species; at present it would scarcely be justifiable to found a new species upon a single immature example. Dr. L. Koch (iEgyptische und Abyssinische Arachniden, Niirn-berg, 1875, p. 27, Taf. iii. fig. 2) describes and figures a new species from Cairo (S. immaculata) ; from this, however, the present Spider differs quite as much as from the typical thoracica, though possibly it may eventually prove to be a variety of Koch's Spider instead of S. thoracica. SCYTODES KOCHII, sp. n. Female, immature, rather over 1| line in length. Although the cephalothorax of this Spider is but little higher at its posterior than at its anterior extremity, it is, I believe, a true Scytodes. The clypeus is broad, truncate, and a little upturned at its lower edge, its height being about equal to the dimensions of one of the fore central pair of eyes ; the colour of the cephalothorax is a rather bright orange-yellow, with a deep-brown band running backwards from each lateral pair of eyes nearly, if not quite, to the hinder margin; these bands are broadest about the middle, and each is marked with a slightly oblique longitudinal stripe of orange-yellow near the fore extremity ; and between them is a deep-brown tapering line running a little way backwards from the central pair of eyes, The |