Mr. BiackwaLr's Descriptions of new Species of Spiders. 643 
joints of the palpi short; the former is very strong and convex in front, 
and the latter projects three apophyses from its extremity ; the largest is 
situated on the outer side, the next in size on the inner side, and the small- 
est underneath ; fifth joint oval, convex and hairy externally, concave 
within, comprising the palpal organs, which are highly developed, com- 
plicated in structure, and of a reddish brown colour. Abdomen oviform, 
convex above, projecting over the base of the cephalo-thorax ; it is thinly 
covered with hairs, glossy and brownish black. Plates of the spiracles 
yellowish white. 
Males of this species, with the palpi fully developed, may be seen in May 
and June among grass and plants growing in the woods about Llanrwst. 
29. Neriéne errans. Cephalo-thorace appendicibusque brunneis, nisi in pe- 
dibus palpisque pallidé rufo-brunneis; abdomine obscure viridescenti- 
brunneo serie medianâ obscura linearum angularium flavescenti-brun- 
nea. 
Length of the female $th of an inch; length of cephalo-thorax Pg; breadth 
zs; breadth of abdomen ; length of an anterior leg 355; length of a 
leg of the third pair +. 
Cephalo-thorax oval, convex above, glossy, with an indentation in the medial 
line of the posterior region. Mandibles powerful, conical, armed with 
teeth on the inner surface, and inclined towards the sternum, which is 
heart-shaped. Maxillæ strong, and inclined towards the lip, which is 
semicircular and prominent at the extremity. These parts are brown, 
the sternum being the palest, and the mandibles, maxillz and lip having 
a tinge of red. Eyes small. Legs and palpi pale red-brown. First and 
fourth pairs of legs, which are the longest, equal in length, third pair the 
shortest. Abdomen oviform, rather convex above, projecting over the 
base of the cephalo-thorax; it is thinly covered with hairs, glossy, of a 
brownish colour faintly tinged with green, and has a series of obscure, 
angular lines, of a pale yellowish brown hue, whose vertices are directed 
forwards, extending along the middle of the upper part. Sexual organs 
dark red-brown. Plates of the spiracles dull yellowish brown. 
The male resembles the female in colour and in the relative length of 
VOL. XVIII. * 
