98 Mr. J. Blackwall on recently discovered Spiders 



part of the abdomen divided, which then form two longitudinal 

 series. 



The name of John Gray, Esq., of Wheatfield House, near 

 Bolton, is associated with this tine species of Nephila (which 

 abounds in the Island of St. Antonio, and constructs its web 

 among the branches of trees), in acknowledgement of the obliga- 

 tion I am under to him for the interesting spiders described in 

 this paper, and for numerous specimens of Araneidea collected 

 in Algeria and Rio de Janeiro. 



Genus Argyopes, Saviguy. 



Argyopes Clarkii. 



Length of the female T 7 T ths of an inch ; length of the cephalo- 

 thorax ±, breadth -^V ; breadth of the abdomen -^V ; length of an 

 anterior leg 1-J- ; length of a leg of the third pair f . 



The cephalothorax is compressed before, rounded in front 

 and on the sides, slightly convex, with a broad shallow indenta- 

 tion in the medial line of the posterior region ; it is of a dark- 

 brown colour, which is concealed by a thick covering of short, 

 ad pressed, white hairs, which have a silvery lustre. The eyes 

 are disposed on the anterior part of the cephalothorax in two 

 transverse rows; the four intermediate ones are seated on a 

 prominence and form a square, the two anterior ones being the 

 largest of the eight ; the eyes of each lateral pair are placed 

 obliquely on a tubercle, and are near to each other, but not in 

 contact, the anterior ones being much the smallest. The falces 

 are powerful, conical, vertical, and armed with teeth on the inner 

 surface; the maxillae are short, strong, and greatly enlarged and 

 rounded at the extremity ; the lip is semicircular, but pointed 

 at the apex; and the sternum is heart-shaped, supplied with 

 hoary hairs, and has eminences on the sides, opposite to the legs. 

 These parts are of a dark-brown colour, the inuer surface and 

 extremity of the falces, the extremity of the maxillae, the apex of 

 the lip, a streak in the medial line of the anterior part of the 

 sternum, and an oval spot at its extremity having a yellow hue. 

 The legs are long, provided with hairs and spines, and have a 

 very dark brown hue, the inferior surface of the coxa? being 

 tinged with yellow ; the first pair is the longest, then the second, 

 and the third pair is the shortest; the tarsi are terminated by 

 claws of the usual number and structure. The palpi are rather 

 paler than the legs, and have a curved, pectinated claw at their 

 extremity. The abdomen, which is oviform, is more convex on 

 the under than on the upper part; it projects over the base of 

 the cephalothorax, and its posterior extremity extends beyond 

 the spinners; the sides arc festooned, four somewhat conical 



