664 
Mr. Buacxwaut's Descriptions of new Species of Spiders. 
a greater absolute length, an anterior one measuring 44ths 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 Claytonie. Maris cephalo-thorace appendicibusque pallidé fla- 
vescenti-rufis ; labio sternique marginibus brunneis ; abdomine livido. 
Length of the male Toth of an inch; length of cephalo-thorax Bg; breadth 
34; breadth of abdomen Ar; 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. Maxillæ 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 cepbalo-thorax; it is thinly clad with 
