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 semicircular
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 thé
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 Walckenaëra 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.
Walckenaëra pumila. PI. XXI, fig. 227.
Walckenaëra 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.
The four intermediate eyes form a trapezoid whose shortest side is before; the other four,
disposed in pairs on the sides of the anterior part of the cephalo-thorax, are the largest,
and the two anterior ones of the trapezoid the smallest of the eight. The cephalo-thorax is
oval, glossy, depressed on the sides, which are marked with slight furrows converging towards
an indentation in the medial line; the falces are moderately strong, conical, armed with teeth
on the inner surface, and inclined towards the sternum, which is broad and heart-shaped; the
maxillae are inclined towards the lip, which is semicircular and prominent at the apex.
These parts are of a dark-brown colour, the falces and maxillae being the palest. The legs
are moderately robust, provided with hairs and some erect spines, and have a reddish-
brown tint; the fourth pair is rather the longest, then the first, which a little surpasses the
second, and the third pair is the shortest; the two superior tarsal claws are curved and pectinated,
and the inferior one is inflected near its base. The palpi resemble the legs in colour.
The abdomen is oviform, convex above, projecting over the base of the cephalo-thorax; it
is thinly clothed with hairs, glossy, and of a black hue, that of the branchial opercula being
dull-yellow.
The male is rather smaller than the female, but it resembles her in colour and in the
relative length of its legs. The anterior part of its cephalo-thorax is prominent but obtuse,
with an oblong indentation on each side, extending backwards from the lateral eyes. The
cubital and radial joints of the palpi are short; the latter is elongated at its extremity, on the
inner side, and projects a short, pointed apophysis in front; the digital joint has a dark-
brown tin t; it is very broad and crescent-shaped at the extremity, narrow and prominent at
the base, convex and hairy externally, concave within, comprising the palpal organs, which
are highly developed, complicated in structure, with a long, curved, filiform spine, originating
in a protuberance near the extremity of the inner limb of the crescent, and a straight, pointed
spine, contiguous to some prominent, transparent membrane, near the extremity of the outer
limb; these organs are of a dark-brown colour, tinged with red.
Both sexes of this spider secrete themselves under stones in moist pastures near Llanrwst.
The male, which has been taken in Berwickshire by Mr. J. Hardy, has the palpal organs
developed in May.
Walckenaera picina. PI. XXI, fig. 228.
Walckenaera picina, Blackw., Linn. Trans., vol. xviii, p. 640.
__ __ Blackw., Annals and Mag. of Nat. Hist., second series, vol. ix,
p. 466.
Avgus picinus, Walck., Hist. Nat. des Insect. Apt., tom. iv, p. 507.
Length of the male, ^th of an inch ; length of the cephalo-thorax, ^th, breadth, ^nd;
breadth of the abdomen, ^th; length of a posterior leg, ith ; length of a leg of the third
pair, Tjth.
The cephalo-thorax has a small indentation in the medial lin e ; the anterior part is promb