Mr. Brackwalx's Descriptions of new Species of Spiders. 633 
noque nigricantibus ; pedibus palpisque rufo-brunneis ; abdomine nitente 
nigro. 
Anterior cephalo-thoracis pars in mare prominens, indentatione utrin- 
que magná. 
Length of the female yth of an inch; length of cephalo-thorax y; breadth 
36; breadth of abdomen 35; length of an anterior leg yr; length of a 
leg of the third pair Nr. 
Cephalo-thorax oval, convex above, glossy, rather prominent before, where the 
eyes are situated, depressed in the posterior region, with a small inden- 
tation in the medial line. Mandibles conical, armed with teeth on the 
inner surface, and inclined towards the sternum, which is broad and. 
heart-shaped. These parts, with the maxillz and lip, are brownish black, 
the mandibles and maxillæ being the palest. Legs and palpi red-brown. 
First and fourth pairs of legs, which are the longest, equal in length, 
third pair the shortest. Abdomen oviform, convex above, projecting 
over the base of the cephalo-thorax; it is thinly covered with hairs, 
glossy, and black. Sexual organs prominent. Plates of the spiracles 
brown. 
The male is rather smaller than the female, and has the anterior part 
of the cephalo-thorax much more prominent, a large indentation occurring 
on the sides, behind each lateral pair of eyes. Relative length of the legs 
the same in both sexes, those of the male being the redder. Fourth joint 
of the palpi brown-black, much larger than the third joint, depressed, 
hairy externally, overlapping the base of the fifth joint, and having its 
extremity curved outwards; immediately above which, on the outer side, 
is a curved, pointed spine, with a projection at its base: fifth joint oval, 
convex and hairy externally, concave within, comprising the palpal or- 
gans; they are highly developed, eomplicated in structure, and have 
several curved, pointed spines at their extremity; their colour is reddish 
brown. 
Numerous individuals of this species were observed running actively on 
rails in meadows and pastures near Llanrwst in December 1836, and Ja- 
nuary 1837. 
