312 
LINYPHIIDiE. 
The legs are slender, and provided with hairs; 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 slightly pectinated, and the inferior one is inflected near its 
base; the palpi are short; the falces are conical, armed with a few teeth on the inner surface, 
and inclined towards the sternum. These parts are of a yellow-brown colour, the legs, which 
are the palest, having the tibiae of the first and second pairs of a dark-brown hue. The 
cephalo-thorax is compressed before, rounded on the sides, convex, particularly in the cephalic 
region, glossy, and has an indentation in the medial line; the maxillae are short, obliquely 
truncated at the extremity, on the outer side, and inclined towards the lip, which is semi¬ 
circular and prominent at the apex; and the sternum is broad, convex, glossy, and heart- 
shaped. These parts are of a dark-brown colour, the sternum and lip being the darkest, and 
the maxillae the palest. The eyes are disposed on the anterior part of the cephalo-thorax; 
the four intermediate ones describe a trapezoid whose anterior side is the shortest, and those 
of each lateral pair are seated obliquely on a minute tubercle, and are contiguous; the 
anterior eyes of the trapezoid are the smallest of the eight. The abdomen is oviform, thinly 
clothed with hairs, glossy, convex above, projecting over the base of the cephalo-thorax, and 
is of a brown-black hue; the sexual organs are highly developed and prominent. 
The sexes are similar in colour, but the male is rather smaller than the female, and the 
anterior part of its cephalo-thorax is more convex. The radial joint of its palpi is much 
stronger than the cubital, and projects from its extremity, on the inner side, a long, slender 
apophysis curved outwards in front of the digital joint, a strong, crescent-shaped one in front, 
towards the outer side, and a short, obtuse one underneath; the digital joint is somewhat 
oval, convex and hairy externally, concave within, comprising the palpal organs, which are 
highly developed, complex in structure, with a black, filiform spine near the middle, curved 
in a circular form, and within the curvature, a black spine enveloped in membrane, and 
directed obliquely forwards and downwards; these organs have a red-brown colour. 
Specimens of this active species, which resembles Walckenaera antica in having the 
tibiae of the first and second pairs of legs of a dark-brown colour, but differs from it 
widely in other particulars, were taken under pieces of rock and stone in Portland, by the 
Rev. O. P. Cambridge, in the summer of 1860. 
Walckenaera pumila. PL XXI, fig. 227. 
Walckenaera pumila, Blackw., Linn. Trans., vol. xviii, p. 639. 
— — Blackw., Annals and Mag. of Nat. Hist., second series, vol. ix, 
p. 466. 
Argus pumilus, Walck., Hist. Nat. des Insect. Apt., tom. iv, p. 508. 
Length of the female, ^th of an inch; length of the cephalo-thorax, ~tli, breadth, 3 ' 8 th; 
breadth of the abdomen, ^th; length of a posterior leg, T ' 5 th; length of a leg of the third 
pair, T jth. 
