Mr. Buackwaut's Descriptions of new Species of Spiders. 655 
from its extremity; one situated in front, and the other, which is the 
smaller, on the inner side; fifth joint oval, convex and hairy externally, 
concave within, comprising the palpal organs ; they are moderately deve- 
loped, complicated in structure, with a curved process at the upper part, 
directed outwards, and a small, black, pointed, curved spine at the ex- 
tremity; their colour is red-brown. Abdomen oviform, convex above, 
projecting over the base of the cephalo-thorax; it is thinly covered 
with hairs, glossy and very dark brown. Plates of the spiracles dull 
yellow. 
The spider described above was found under a stone in a moist pasture at 
Oakland, in May 1838. 
Genus Linypuia, Latr. 
Al. Linyphia cauta. Cephalo-thorace flavescenti-brunneo, marginibus lineâque 
medianâ anticè dilatatà nigris; mandibulis maxillisque brunneis ; labio 
sternoque nigricantibus ; pedibus palpisque flavescenti-brunneis nigro- 
fasciatis ; pedum pari 1mo longissimo, dein 2do, 3tio brevissimo ; abdo- 
mine flavescenti-brunneo albo-punctato, antic? nigricanti-guttato postice 
transversim lineato, lateribus nigricantibus fascià longitudinali medianâ 
flavescenti-brunneâ albo-maculatà, maculis tribus confluentibus flavis 
rhomboidem efformantibus ad basin filatoriorum inferiorum. 
Length of the female ths of an inch; length of cephalo-thorax js; breadth 
js; breadth of abdomen 75; length of an anterior leg 45; length of a 
leg of the third pair 2. 
The anterior part of the cephalo-thorax, on which are distributed some long 
hairs. directed forwards, is compressed ; and in the medial line of the 
posterior region there is a large indentation ; it is of a yellowish brown 
colour, with black margins, and a band of the same hue extending along 
the middle, whose anterior extremity is greatly enlarged. The eyes, 
which are seated ón black spots, are arranged in two transverse rows on 
the fore part of the cephalo-thorax ; the intermediate ones form a trape- 
zoid, whose anterior side is the shortest; the other four are disposed in 
pairs on the sides of the trapezoid, the eyes constituting each pair being 
placed obliquely on an eminence, and almost contiguous; the posterior 
