WALCKENAERA. 
293 
largest of the eight, and the anterior eyes of the trapezoid are the smallest. The palpi have 
a red-brown tint, the radial and digital joints being much the darkest; the humeral joint is 
curved towards the cephalo-thorax, and the cubital and radial joints are clavate, the latter, 
which is the stronger, projecting two apophyses from its extremity, the larger situated in front, 
and the smaller on the under side; the digital joint is oval, convex and hairy externally, con¬ 
cave within, comprising the palpal organs; these organs are moderately developed, com¬ 
plicated in structure, with a small, curved spine, enveloped in membrane, at their extremity, 
and are of a dark, reddish-brown colour. The abdomen is oviform, sparingly clothed with 
hairs, and of a brownish-black hue, that of the branchial opercula being yellowish-brown. 
In December, 1848, Mr. J. Hardy forwarded to Oakland an adult male of this species, 
with other specimens of Araneidea, which he had captured in Berwickshire. 
Walckenaera unicornis. PI. XX, fig. 207. 
Walckenaera unicornis, Camb., Annals and Mag. of Nat. Hist., third series, vol. vii, 
p. 437. 
Length of the male, T ' 5 th of an inch; length of the cephalo-thorax, rj a th, breadth, ^th; 
breadth of the abdomen, ^th; length of a posterior leg, f 5 ttis; length of a leg of the third 
pair, ^th. 
The legs are slender, provided with hairs, and have a yellowish-red hue; the fourth pair 
is the longest, then the first, and the third pair is the shortest; each tarsus is terminated by 
three claws; the two superior ones are curved and pectinated, and the inferior one is inflected 
near its base. The palpi are short and resemble the legs in colour, the digital joint having a 
tinge of brown; the radial is larger than the cubital joint, and projects from its extremity a 
long, bifid apophysis, curved obliquely, in front of the digital joint, and a short, obtuse 
one underneath; the digital joint is somewhat oval, with a lobe on the outer side, near its 
base; it is convex and hairy externally, concave within, comprising the palpal organs, which 
are very highly developed, prominent, complicated in structure, with a black, filiform spine 
at their extremity, on the outer side, which is enveloped in membrane, and curved in 
a circular form ; these organs are of a dark, reddish-brown colour. The cephalo- 
thorax is oval, convex, glossy, rather prominent before, with a short, vertical prominence 
situated in the middle of the space surrounded by the eyes, whose summit is somewhat 
enlarged and slightly notched, and is of a dark-brown colour, tinged with red. The eyes are 
disposed on the anterior part of the cephalo-thorax, high above the frontal margin ; the four 
intermediate ones describe a trapezoid whose anterior side is the shortest, and those of each 
lateral pair are seated obliquely on a small tubercle, and are contiguous; the anterior eyes of 
the trapezoid are the smallest of the eight. The falces are conical, divergent at the extremity, 
armed with a few teeth on the inner surface, and inclined towards the sternum; the maxillae 
are short, and strongly inclined towards the lip, which is semicircular and prominent at the 
apex. These organs are of a brownish-red colour, the base of the lip being the darkest. The 
sternum is heart-shaped, convex, glossy, and of a dark-brown colour, tinged with red. The 
