Mr. Blackwall's Descriptions of new Species of Spiders. 623 



a curved claw at their extremity. Eyes disposed on the fore-part of the 

 cephalo-thorax in two transverse, curved, nearly parallel rows, whose con- 

 vexity is directed backwards ; the lateral eyes, which are seated on a small 

 eminence, and are nearly contiguous, are the largest, and the interme- 

 diate ones of the anterior row the smallest of the eight. Abdomen short, 

 broad, thickly covered with hairs, convex above, projecting over the base 

 of the cephalo-thorax ; it is of a dull blackish brown colour, interspersed 

 with obscure, yellowish brown spots, which are most conspicuous on the 

 sides ; the under part is the palest. The spinnei'S are arranged in a trans- 

 verse row immediately below the anus ; the exterior ones, which are much 

 the longest, are triarticulate, and have the spinning-tubes disposed along 

 the inferior surface of the terminal joint ; second joint of all the spinners 

 reddish brown, the other joints yellowish white. Sexual organs promi- 

 nent. Plates of the spiracles whitish. 



" Females of this species were discovered in February 1837, under stones on 

 Gallt y Rhyg, a mountain in Denbighshire, near Llanrwst. 



11. Agelena nava. Saturate brunnea fer^ nigra. 



Length of the female, not including the spinners, -iVth of an inch ; length of 

 cephalo-thorax ^; breadth ^; breadth of abdomen ^; length of a 

 posterior leg ^V ; length of a leg of the third pair -^t- 



Anterior part of the cephalo-thorax compressed ; sides depressed, marked with 

 furrows diverging from the upper part to the margins ; a row of fine 

 bristles, directed forwards, extends along the middle, and in the posterior 

 region, which is depressed, there is an indentation. Mandibles strong, 

 conical, vertical. Maxillae short, convex at the base, round at the extre- 

 mity, and inclined towards the lip, which is nearly quadrate, being rather 

 broader at the base than the extremity. Sternum heart-shaped. These 

 parts are glossy, and, with the legs and palpi, are of a dark brown colour, 

 the margins of the cephalo-thorax and the base of the lip being much the 

 darkest. Fourth pair of legs the longest, then the first, third pair the 

 shortest. Tarsi terminated by two curved, pectinated claws. Eyes dis- 

 posed on the fore-part of the cephalo-thorax in two transverse, curved 



