REV. O. P. CAMBRIDGE ON NEW AND RARE BRITISH SPIDERS. 551 
The palpal organs are well developed, but not very complex ; a strongish, coiled, sharp- 
pointed, black spine issues from their fore extremity on the outer side, and, curving 
backwards, forms a close-fitting but largish circle at that part. 
The abdomen is of an elongate oval form, and is sparingly clothed with hairs. 
A single example of this species was received in November 1871 from Mr. James 
Hardy, by whom it was found in Coldmartin Moss, near Wooler, Northumberland, in 
the autumn of the same year, and kindly forwarded to me, with many other new and 
rare spiders. 
WALCKENAÉRA INCURVATA, sp. n. (Pl. XLVI. fig. 20.) 
Male adult, length scarcely $ of a line. 
The cephalothorax is rather short and broad, and of a greenish yellow-brown colour, 
the normal grooves and indentations are indicated by dusky lines; the summit of the 
caput is very slightly raised above the general level of the thorax; but the occiput is 
rather full and rounded. 
The eyes are on black spots, in the usual four pairs : those of the hind central pair are 
on the summit of the caput; these are apparently oval in shape and are placed obliquely, : 
a somewhat unusual position, and with scarcely an eye's diameter's distance between them, 
being closer to each other than each is to the hind lateral on its side; the laterals are 
as large as the hind centrals, and are placed obliquely and contiguously to each other, 
on the slightest possible tubercle; those of the fore central pair are very small, dark- 
coloured, and contiguous to each other, being removed from the hind centrals by the 
space of about once and a half the diameter of the latter. 
The height of the c/ypeus is equal to about half that of the facial space. 
The legs are neither very long nor strong; their relative length is 1, 4, 3, 2; they are 
very pale yellow, the femora slightly tinged with reddish brown, and are furnished only 
with short fine hairs and one or two very slender erect bristles. 
Palpi moderately long, rather slender, and similar in colour to the legs: the cubital 
joint is short and a little bent; the radial is rather stronger, and has its fore extremity 
on the upper side produced into a somewhat tapering apophysis, whose sharp-pointed 
extremity is sharply recurved, or crooked downwards; the digital joint is of moderate 
size; and the palpal organs are well developed; they have, connected with them, a long, 
slender, tapering, filiform, black spine, by which they are almost completely encircled 
across their middle; this spine has a bold curve below the palpal organs, and, passing 
from the midway somewhat sinuously along the inner side, terminates with its hair-like 
point beneath the extremity of the digital joint. Within the strongest curve of this 
spine is a kind of whitish lobe, from the centre of which there springs a prominent, 
nearly straight, sharp-pointed black spine, its point directed forwards. 
The falces are straight, and neither very long nor strong, and, with the maxillæ, are 
similar to the cephalothorax in colour. 
The sternum and labium are normal in form, the latter rather darker than the maxillz, 
and the former blackish. 
The abdomen is oval and black, moderately convex above, but it does not project much 
