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Show 1876.] REV. O. P. CAMBRIDGE ON EGYPTIAN SPIDERS. 573 to the rest of these organs; but generally it sticks out in a very noticeable way. The falces are long and strong, divergent* and rather excavated on their inner sides near their extremities, where they are armed with several strongish teeth; they, as well as the maxilla^ labium, and sternum, are of a similar colour to the cephalothorax. The abdomen is of a longish oval form, and projects a little over the base of the cephalothorax ; it is of a brownish black colour, with a large pale patch just above the spinners, but not touching them* The female resembles the male in colours j but the abdomen is larger and more globular, and the genital aperture is furnished with a strong curved epigyne which is directed prominently backwards ; the relative length of the legs also differs in the female, those of the fourth pair being distinctly longer than those of the second pair. Adults of both sexes were found on plants and shrubs both at Cairo and Alexandria. Gen. PACHYGNATHA, Sund. P A C H Y G N A T H A A R G Y R O S T I L B A , sp. n. (Plate L I X . fig. 8.) Adult male, length 1 line. The cephalothorax looked at in profile has a uniformly sloping and very slightly curved outline from the hind margin to the eyes; the area of the four central eyes is rather prominent. The clypeus, compressed close beneath the eyes, but rather prominent at its lower margin, equals in height half the facial space ; it is of an orange-yellow- brown colour, with three longitudinal (but not very definitely outlined) dark yellow-brown bands; the lateral bands unite in front on the lower part of the clypeus. The eyes are seated on tubercles, and do not differ greatly in size ; the four central ones are the largest, and of very nearly uniform size, forming a square whose fore side is a little the shortest; the intervals between these eyes are scarcely a diameter; the eyes of each lateral pair are contiguous to each other on a single tubercle, the foremost being* if there be any difference, the smallest of the eight; the interval between each of these and that one of the four central eyes nearest to it in the same row appears slightly to exceed the interval between those of the central pair in that row. The legs are long and slender, their relative length being 1, 2, 4, 3 j they are of a dull yellowish colour slightly suffused with brown at the fore extremities of the tibiae and metatarsi, and well furnished with rather conspicuous hairs. The palpi are slender, and similar to the legs in colour. The cubital joint is short, nodiform at its base on the upperside, and constricted near its fore extremity; the radial joint is about equal in length to the cubital, but is much stronger, especially towards its fore extremity* The digital joint is large, and of the same peculiar form as in others of the genus, the smaller division being of a somewhat S-shape ; the palpal organs are very simple, consisting of a compara- P R O C . Z O O L . S o c - 1 8 7 6 , No.*XXXVIIL 38 |
