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



a greater absolute length, an anterior one measuring i^ths of an inch. 

 Third and fourth joints of the palpi short, the latter, which is much the 

 stronger, being produced on the inner side ; fifth joint somewhat oval, 

 with a prominent lobe near the extremity, on the inner side ; it is convex 

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

 are highly developed, complicated in structure, with two contiguous, black, 

 spiral spines, enveloped in a delicate membrane, at their extremity ; they 

 are of a dark reddish brown colour. 



This species was found under stones in a moist pasture at Oakland, in 

 May 1838. 



47. Linyphia Claytonice. Maris cephalo-thorace appendicibusque pallid^ fla- 

 vescenti-rufis ; labio sternique marginibus brunneis ; abdomine livido. 



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

 -^4- ; breadth of abdomen ^ ; length of an anterior leg \ ; length of a leg 

 of the third pair \. 



Cephalo-thorax oval, convex above, glossy, with an indentation in the medial 

 line of the posterior region, and some fine bristles, directed forwards, on 

 the middle of the anterior part. Mandibles long, powerful, conical, pro- 

 vided with a small protuberance in front, near the base, one or two mi- 

 nute teeth on the inner surface, and inclined towards the sternum, which 

 is broad and heart-shaped. Maxillae straight, and somewhat quadrate. 

 Lip semicircular and prominent at the extremity. Legs long and slen- 

 der, first pair the longest, then the second, third pair the shortest. These 

 parts are of a light yellowish red colour, with the exception of the 

 lip, and the margins of the sternum, which are brown. Eyes seated on 

 black spots, those constituting the anterior pair of the trapezoid being 

 the smallest of the eight. The palpi resemble the legs in colour ; third 

 and fourth joints short, the latter being much the stronger ; fifth joint 

 oval, convex and hairy externally, concave within, comprising the palpal 

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

 with two contiguous, curved spines, enveloped in membrane, near their 

 middle, and of a red-brown colour. Abdomen oviform, convex above, 

 projecting over the base of the cephalo-thorax; it is thinly clad with 



