187G.] REV. O. P. CAMBRIDGE OS EGYPTIAN SPIDERS. 5/3 



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 ; 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. 

 Pachygnatha argyrostilua, sp. n. (Plate LIX. 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 in- 

 tervals 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 ; 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 cubi- 

 tal joint is short, nodiform at its base on the upperside, and con- 

 stricted 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- 

 Proc. Zool. Soc— 1876, No. XXXVIII. 38 



