Mr. J. Blackwall on newly discovered Spiders. 29 



VII. — Descriptions of newly discovered Spiders captured in Rio 

 Janeiro by John Gray, Esq., and the Rev. Hamlet Clark. 

 By John Blackwall, F.L.S. 



[Concluded from vol. x. p. 439.] 

 Epeira audax. 

 Length of the female f ths of an inch ; length of the cephalo- 

 thorax ^^ ; breadth \ ; breadth of the abdomen \ ; length of an 

 anterior leg ^ ; length of a leg of the third pair ^. 



The eyes are seated on the anterior part of the cephalothorax; 

 the four intermediate ones are placed on a prominence and form 

 a square, the two anterior ones being the largest of the eight ; 

 the eyes of each lateral pair are seated on a tubercle,''and are 

 near to each other, but not in contact. The cephalothorax is 

 compressed before, rounded on the sides, convex, particularly in 

 the cephalic region, immediately behind the eyes, glossy, thinly 

 clothed with whitish hairs, and has a large transverse indenta- 

 tion in the medial line ; the fakes are strong, conical, vertical, 

 convex in front, and armed with teeth on the inner surface. 

 These parts are of a brown colour, the latter being tinged with 

 yellow at the extremity, on the inner side. The maxillae are 

 short, straight, powerful, and enlarged and rounded at the ex- 

 tremity ; the lip is semicircular, but slightly pointed at the 

 apex ; and the sternum is heart-shaped, with small prominences 

 on the sides, opposite to the legs : the colour of these parts is 

 very dark brown, the extremity of the maxillae and the apex of 

 the lip having a pale yellowish hue. The legs are moderately 

 long and robust, and are provided vnth hairs and fine spines ; 

 the first and second pairs are of a yellowish-brown colour, the 

 metatarsi and tarsi being the darkest, and the tibiae are marked 

 with brown annuli, which are most conspicuous on their inferior 

 surface; the femora of the third and fourth pairs are of a 

 brownish-black colour, with the exception of the base, which 

 has a pale yellowish hue, and the genual joint, the base and 

 extremity of the tibiae and of the metatarsi, and the whole of the 

 tarsi, have a dark brown colour, that of the intermediate space 

 of the tibiae and metatarsi being yellowish-brown ; the first pair 

 is the longest, then the second, and the third pair is the shortest; 

 each tarsus is terminated by claws of the usual number and 

 structure. The palpi have a brown hue, the humeral and cubital 

 joints being tinged with yellow, and have a curved pectinated 

 claw at their extremity. The abdomen is triangular, with its 

 vertex directed backwards, and is sparingly clothed with whitish 

 hairs ; it has three tubercles at its anterior extremity, two con- 

 stituting the lateral angles and one intermediate, four disposed 

 on each side, and three in a vertical row at its posterior extra- 



