Mr. Blackwall's Descriptions of new Species of Spiders. 645 



upper part ; another curved, corneous process, whose point is enveloped 

 in a delicate membrane, extends from the upper part to the extremity of 

 the fifth joint, and within its curvature a small, dentated spine occurs ; 

 their colour is red-brown. 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 pale yellow. 



Adult males of this species were taken in February 1837, under fragments 

 of rock imbedded in earth in the woods about Llanrwst. 



31. Neriene viaria. Mas brunneus ; abdomine nigricante ; filatoriis pallid^ 

 flavescenti-brunneis. 



Length of the male -roth of an inch ; length of cephalo-thorax ^ ; breadth 

 ^ ; breadth of abdomen ^ ; length of an anterior leg ^ ; length of a 

 leg of the third pair ^. 



Cephalo-thorax oval, moderately convex above, glossy, with slight furrows on 

 the sides, and an indentation in the medial line of the posterior region. 

 Mandibles powerful, conical, armed with teeth on the inner surface, rather 

 divergent at the extremities, and inclined towards the sternum, which is 

 broad and heart-shaped. Maxillae inclined towards the lip, which is 

 semicircular and prominent at the extremity. First and fourth pairs of 

 legs the longest and equal in length, third pair the shortest. These parts 

 are brown, the margins of the cephalo-thorax and the lip being the dark- 

 est, and the legs and maxillae the palest. Intermediate eyes of the ante- 

 rior row much the smallest of the eight. The palpi resemble the legs in 

 colour ; the third and fourth joints are short, the former, which is the 

 stronger, having some long hairs projecting from its extremity, in front ; 

 the latter is gibbous underneath, at the base ; fifth joint somewhat oval, 

 with a large lobe on the outer side ; it is convex and hairy externally, 

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

 complicated in structure, very prominent, and of a pale reddish brown 

 colour. Abdomen oviform, convex above, projecting over the base of the 

 cephalo-thorax ; it is thinly covered with hairs, glossy, and of a dark 

 brown hue, approaching to black. Plates of the spiracles and spinners 

 pale yellowish brown. 



4 p 2 



