undescribed Genera and Species of Araneidae. 1 95 



lothorax y 1 ^ ; breadth j 1 ^ ; breadth of the abdomen T \j ; length 

 of a posterior leg f ; length of a leg of the third pair £. 



The male though smaller than the female is similar to it in 

 colour, and in the relative length of its legs. The third and 

 fourth joints of the palpi are short, a small pointed apophysis 

 projecting from the outer side of the anterior extremity of the 

 latter; the fifth joint is oval, convex above, concave beneath, 

 comprising the sexual organs, which are highly developed, 

 with a curved spiny process extending to the termination of 

 the joint, and are of a red- brown colour. 



This species, which I discovered in the woods about Oak- 

 land, in Denbighshire, in the month of April 1833, approxi^ 

 mates most nearly in its general structure to the spiders of 

 the genera Lycosa and Dolomedes ; by the organization of the 

 feet, however, it appears to connect the Citigradae with the 

 Later igradce. In the month of June the female constructs a 

 lenticular cocoon of white silk, of a slight texture, measuring 

 about yyths of an inch in diameter, which she usually attaches 

 to the under side of a stone, depositing in it between twenty 

 and thirty spherical eggs of a yellowish-white colour, not ag- 

 glutinated together. 



Tribe, Tubitel.se, Latreille. 

 Genus, Erigone, Savigny. 

 Erigone aira, 

 Cephalothorax inversely heart-shaped, very prominent before, 

 with an indentation in the medial line of the posterior region. 

 Mandibles powerful, rather convex in front, strongly toothed 

 on the inner surface, and slightly inclined towards the pectus, 

 which is heart-shaped. Maxillae greatly enlarged at the base 

 where the palpi are inserted, encompassing the lip, which is 

 short and semicircular. Fourth pair of legs the longest, then 

 the first, the third pair being the shortest. The two superior 

 tarsal claws are pectinated, and the inferior one is inflected 

 near its base. Eyes disposed in two transverse rows on the 

 summit of the anterior convexity of the cephalothorax ; the 

 intermediate ones of both rows form a square, and the other 

 four are placed obliquely in pairs, one on each side of the 

 square. Abdomen oval, convex above, projecting over the 

 base of the cephalothorax. This spider is sparingly clad with 

 hair, and glossy black, with the exception of the legs and palpi, 

 which, in adults, are of a reddish-brown colour, and of the 

 plates of the spiracles, which are yellow. 



Length, from the anterior part of the cephalothorax to the 

 extremity of the abdomen, ^th of an inch ; breadth of the ab- 

 domen ^ ; length of a posterior leg J. 



2 C2 



