648 Mr. Blackwall's Descriptions of new Species of Spiders. 



Anterior part of the cephalo-thorax slightly compressed ; posterior part 

 depressed, with an indentation in the medial line. Mandibles conical, 

 armed with teeth on the inner surface and a tooth-like process in front, 

 near the extremity ; tliey are inclined towards the sternum, which is 

 broad and heart-shaped. Maxillee strong and inclined towards the lip, 

 which is semicircular and prominent at the extremity. These parts, with 

 the legs, are glossy and of a brown colour, the mandibles and lip being 

 the darkest. First and fourth pairs of legs the longest and equal in 

 length, tliird pair the shortest. The palpi are brown, the fourth joint 

 being much the darkest ; tliird and fourth joints short ; the latter is pro- 

 duced, very prominent and pointed in front, with a large projection near 

 its base, on the inner side ; fifth joint oval, convex and hairy externally, 

 concave within, comprising the palpal organs, which are highly developed, 

 complicated in structure, with a bold projection at the upper part, on the 

 outer side, and one or two small, pointed ones at the extremity ; they are 

 of a red-brown colour. Abdomen oviform, convex above, projecting over 

 the base of the cephalo-thorax ; it is thinly covered with hairs, glossy and 

 dark brown. Plates of the spiracles pale yellow. 



Males of this very small species, with their palpal organs completely 

 developed, were discovered on rails at Oakland, near Llanrwst, in January 

 1837. 



:Mi. Neriëne rubella. Flavescenti-rufa ; labio rufo-brunneo. 



Maris pedes anteriores posterioribus longiores ; paris Imi et 2di tibiae 

 infra prope apicem dilatatœ. 



Length of the female ^th of an inch ; length of cephalo-thorax ^ij ; breadth 

 2^4 ; breadth of abdomen tj'ô; length of an anterior leg -0%; length of a leg 

 of the third pair ^. 



Anterior part of the cephalo-thorax compressed and rather prominent; in the 

 medial line of the posterior region there is an indentation. Mandibles 

 robust, conical, armed with teeth on the inner surface and inclined 

 towards the sternum, which is broad, convex and heart-shaped. These 

 parts, with the maxillae, are yellowish red, and the lip is red-brown. 

 Legs and palpi pale yellowish red. First and fourth pairs of legs the 



