640 Mr. BLACKWALU'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. Walckenaéra picina. Mas nigricans, nisi in pedibus rufo-brunneis ; horum 
pari 4to Imo pauld longiore; cephalo-thorace anticè elevato obtuso in- 
dentatione utrinque magna. 
Length of the male th of an inch; length of cephalo-thorax g; breadth 3; 
breadth of abdomen 4; ; length of a posterior leg EN 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 inner surface, and inclined towards the sternum, 
which is broad and heart-shaped. Maxille inclined towards the lip, 
Which is semicircular and prominent at the extremity. These parts are 
glossy and brownish black, the mandibles and maxillæ 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 
