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



and has a small, pointed apophysis in front ; fifth joint of an irregular 

 figure, having a long process or lobe on the inner side, and a bold pro- 

 minence at the upper part, from which a ridge extends to its extremity ; 

 it is convex and hairy externally, concave within, comprising the palpal 

 organs, which are highly developed, complicated in structure, with a long, 

 black, prominent, filiform spine, enveloped in a delicate membrane, curved 

 from the upper part downwards to their extremity, where it is directed to 

 the outer side ; their colour is pale reddish brown. 



This spider conceals itself under stones in moist pastures near Llanrwst. 

 The male has the palpal organs developed in May. 



26. IFalchenaera picina. Mas nigricans, nisi in pedibus rufo-brunneis ; horum 

 pari 4to Imo paul6 longiore ; cephalo-thorace antic^ elevato obtuso in- 

 dentatione utrinque magna. 



Length of the male yjth of an inch ; length of cephalo-thorax -^ ; breadth ^ ; 

 breadth of abdomen ^; length^of a posterior leg -j^; length of a leg of 

 the third pair ■^. 



Anterior part of the cephalo-thorax elevated, but obtuse, with a large indenta- 

 tion immediately behind each lateral pair of eyes ; in the medial line of 

 the posterior region there is a small indentation. Mandibles conical, 

 ' armed with teeth on the iimer surface, and inclined towards the sternum, 

 which is broad and heart-shaped. Maxillae inclined towards the lip, 

 which is semicircular and prominent at the extremity. These parts are 

 glossy and brownish black, the mandibles and maxillae being the palest. 

 Legs red-brown ; fourth pair rather the longest, then the first, third pair 

 the shortest. One pair of eyes is placed on the anterior part of the sum- 

 mit of the frontal elevation of the cephalo-thorax ; the eyes of another 

 pair, situated lower, in front, and constituting the shortest side of a tra- 

 pezoid, which they describe with the former, being the smallest of the 

 eight ; those of each lateral pair are contiguous. The palpi are brown ; 

 the fourth joint is much larger than the third, and has the upper part of 

 its extremity greatly produced, and tapering to a point, which curves in 

 front of the fifth joint, towards its outer side ; fifth joint oval, convex and 

 hairy externally, concave within, comprising the palpal organs ; they are 



