Mr. Blackwalls Descriptions of new Species of Spiders. 633 



noqiie nigricantibus ; pedibus palpisque rufo-brunneis ; abdomine nitente 

 nigro. 



Anterior cephalo-thoracis pars in mare proniinens, indentatione utrin- 

 que magna. 



Length of the female ^jth of an inch; length of cephalo-thorax -sV ; breadth 

 ■gV ; breadth of abdomen 3^ ; length of an anterior leg yt ; length of a 

 leg of the third pair xj. 



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 maxilloe and lip, are brownish black, 

 the mandibles and maxilke 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, complicated 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- 



