Mr. Blackwall's Descriptions of new Species of Spiders. 659 



in front; the fourth joint is gibbous underneath, and has three short 

 apophyses before, the middle one, which is the largest and darkest co- 

 loured, being transversely striated in front; fifth joint somewhat oval, 

 with a slightly curved, conical prominence at the upper part ; it is con- 

 vex and hairy externally, concave within, comprising the palpal organs, 

 which are prominent, highly developed, complicated in structure, with 

 a slightly curved, pointed spine, and a finer one, enveloped in a semi- 

 transparent membrane, at their extremity ; they are of a red-brown 

 colour. The convex sides of the terminal joints are directed towards 

 each other. 



Both sexes of this species, which bears a striking resemblance to Linyphia 

 cauta, were discovered in the greenhouse and melon-pits belonging to Mrs. 

 Darbishire, of Green Heys, near Manchester, in September 1836. Compare 

 Linyphia glohosa, Wider, Mus. Senkenb. i. p. 259. t. 17- f. 9. 



43. Linyphia sylvatica. Cephalo-thorace mandibulis maxillis labio sternoque 

 saturate, pedibus palpisque flavescenti-brunneis; abdomine fascia mediana 

 lata dentata saturate brunnea albido-marginata ; lateribus saturate brun- 

 neis fascia longitudinali albida. 



Maris pedes flavescenti-rufi ; abdomen subcylindricum, saturate brun- 

 neum, antice utrinque macula alba notatum. 



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

 -^ ; breadth of abdomen -yj ; length of an anterior leg f ; length of a leg 

 of the third pair \. 



Cephalo-thorax oval, convex above, glossy, with a few slight furrows on the 

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

 Mandibles powerful, conical, convex in front, armed with two rows of 

 teeth on the inner surface, and slightly inclined towards the sternum, 

 which is heart-shaped. Maxillae strong, straight, and somewhat qua- 

 drate. Lip semieircular and prominent at the extremity. These parts 

 are of a very dark brown colour, the cephalo-thorax being the palest. 

 The intermediate eyes form a trapezoid, whose anterior side is the short- 

 est, the posterior pair being the largest of the eight. Legs and palpi 

 , long, slender, and of a yellowish brown colour, occasionally tinged with 

 VOL. xviii. 4 R 



