648 Mr. BxackwaLv'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; they are inclined towards the sternum, which is 
broad and heart-shaped. Maxillæ 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, third pair the shortest. The palpi are brown, the fourth joint 
being much the darkest; third 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. 
35. Neriéne rubella. Flavescenti-rufa; labio rufo-brunneo. 
Maris pedes anteriores posterioribus longiores; paris 1mi et 2di tibiæ 
infra prope apicem dilatatze. 
Length of the female -Lth of an inch: length of cephalo-thorax 45; breadth 
34; breadth of abdomen 4 ; length of an anterior leg 20; length of a leg 
of the third pair 4. 
Anterior part of the cephalo-thorax compressed aud 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 maxille, are yellowish red, and the lip is red-brown. 
Legs and palpi pale yellowish red. First and fourth pairs of legs the 
