Mr. Blackwall's Descriptions of new Species of Spiders. 631 



^ ; breadth of abdomen -g^ ; length of an anterioi" leg -p£ ; length of a 

 leg of the third pair ^j. 

 Cephalo-thorax oval, convex above, glossy, slightly prominent behind the 

 eyes, with a small indentation in the medial line of the posterior region ; 

 it is of a dark brown colour. Mandibles conical, armed with teeth on 

 the inner surface, and inclined towards the sternum ; they are of a dark 

 brown colour, slightly tinged with red. Maxillae rather paler than the 

 mandibles. Sternum broad, heart-shaped, and convex ; it and the lip 

 are of a dark brown hue. Legs and palpi reddish brown. First and 

 fourth pairs of legs, which are the longest, equal in length, third pair 

 the shortest. Tarsi terminated by three claws ; the two superior ones 

 are curved and pectinated, and the inferior one is inflected near its 

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

 cephalo-thorax ; it is thinly covered with hairs, and is of a brown co- 

 lour, mottled with darker brown. Plates of the spiracles pale yellowish 

 brown. 



The male is darker coloured than the female, and has on the anterior 

 part of the cephalo-thorax a strong prominence, deeply indented on the 

 sides, on which the eyes are seated. Immediately before each eye of the 

 superior pair is a large, obtuse protuberance. Fourth joint of the palpi 

 rather larger than the third, projecting a strong apophysis in front, which 

 is bifurcated, the inner process being longer and more pointed than the 

 outer one ; fifth joint oval, convex and hairy externally, concave within, 

 comprising the palpal organs ; they are highly developed, complicated in 

 structure, prominent, with a fine, curved spine at the extremity, and are 

 of a red-brown colour. 



Specimens of Walckenaera turgida were discovered in September and Octo- 

 ber 1836, under stones and blocks of wood in the plantations at Crumpsall 

 Hall, near Manchester. - 



18. IValchenaera atra. Nigra; mandibulis maxillis pedibus palpisque brunneis. 

 Anterior cephalo-thoracis pars in mare elevata obtusa, indentatione 

 utrinque oblonga. 



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



