302 
LINYPHIIDiE. 
WALCKENAERA HIEMALIS. PI. XXI, fig. 217. 
Walckenaera hiemalis, Blackw., Linn. Trans., vol. xviii, p. 632. 
— — Blackw., Annals and Mag. of Nat. Hist., second series, vol. ix, 
p. 464. 
Length of the female, ~th of an inch; length of the cephalo-thorax, ^th, breadth, j' g th; 
breadth of the abdomen, j 5 nd; length of an anterior leg, T ’ T th ; length of a leg of the third 
pair, Ath. 
The cephalo-thorax is oval, convex, glossy, rather prominent in front, where the eyes 
are situated, depressed in the posterior region, with a small 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. These parts, with the maxillae and 
lip, have a brownish-black hue, the falces and maxillae being rather the palest. The legs and 
palpi are of a red-brown colour. The two superior tarsal claws are curved and pectinated, 
and the inferior one is inflected near its base. 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 brown ; the sexual organs are prominent. 
The male is rather smaller than the female. The anterior part of its cephalo-thorax is 
prominent, and there is a large indentation behind each lateral pair of eyes. The radial joint 
of the palpi has a brown-black tint; it is much larger than the cubital joint, depressed and 
hairy, overlapping the base of the digital joint, and is curved outwards at its extremity, imme¬ 
diately above which, on the outer side, there is a curved, pointed spine, with a process at its 
base; the digital joint is oval, convex and hairy externally, concave within, comprising the 
palpal organs; they are highly developed, complicated in structure, with several curved, 
pointed spines at their extremity, and are of a reddish-brown colour. 
Numerous individuals of this species were observed running actively on rails in meadows 
and pastures near Llanrwst in December, 1836, and January, 1837. 
In his ‘ Histoire Naturelle des Insectes Apteres,’ tom. iv, p. 510, M. Walckenaer has added 
Walckenaera hiemalis to the synonyma of Argus cucullatus, from which it differs in size, colour, 
and organization. In the form of the anterior part of the cephalo-thorax and in the dispo¬ 
sition of the eyes, the male.s of these spiders are very dissimilar. 
WALCKENAiiRA BIFRONS. PI. XXI, fig. 218. 
Walckenaera bifrons , Blackw., Linn. Trans., vol. xviii, p. 634. 
— — Blackw., Annals and Mag. of Nat. Hist., second series, vol. ix, 
p. 464. 
Argus — Walclt., Hist. Nat. des Insect. Apt., tom. iv, p. 510. 
