walckenaera. 
309 
The legs are long, slender, hairy, and have a bright, 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 resemble the legs in colour, but the radial and digital 
joints are tinged with brown; the cubital joint is clavate; the radial joint projects two 
apophyses from its extremity; one, on the inner side, is large, pointed, curved outwards in 
front of the digital joint, and has near its base a minute process on the convex side, and a 
laro-e obtuse one on the opposite side; the other apophysis, which is smaller and obtuse, is 
situated underneath ; the digital joint is somewhat oval, convex and hairy externally, concave 
within, comprising the palpal organs; these organs are highly developed, complicated in 
structure, with two long, filiform, contiguous black spines enveloped in membrane, originating 
near the middle, and curved in a circular form on the outer side; a shorter one, also origi¬ 
nating near the middle, and enveloped in membrane, is curved obliquely downwards, and 
their prevailing colour is brownish-red. The convex sides of the digital joints are directed 
towards each other. The cephalo-thorax is oval, convex, glossy, with a strong, vertical 
prominence before, which is somewhat compressed on the sides and surmounted by a few 
hairs; the falces are small, conical, armed with teeth on the inner surface, and inclined 
towards the sternum, which is broad, glossy, and heart-shaped; the maxillae are powerful, 
and curved towards the lip, which is semicircular and prominent at the apex. These parts 
are of a brownish-red colour, with the exception of the anterior prominence of the cephalo- 
thorax, which has a dark-brown hue, tinged with red. The eyes are seated on the anterior 
part of the cephalo-thorax, two on the summit of the vertical prominence, and the other six 
at its base, in front, each lateral pair being placed obliquely. The abdomen is oviform, 
convex above, and projects over the base of the cephalo-thorax ; it is sparingly clothed with 
hairs, glossy, and of a brownish-black colour, that of the branchial opercula being pale, 
yellowish-white. 
Adult males of this species were discovered under stones in the woods about Hendre 
House, near Llanrwst, in October, 1855. 
Walckenaera cristata. PI. XXI, fig. 224. 
Walckenaera cristata, Blackw., Lond. and Edinb. Phil. Mag., third series, vol. iii, 
p. 107. 
_ — Blackw., Research, in Zool., p. 317, pi. 2, figs. 7—10. 
_ _ Blackw., Annals and Mag. of Nat. Hist., second series, vol. ix, 
p. 465. 
Theridion bicorne, Wider, Museum Senckenb., Band i, p. 220, taf. 14, fig. 12. 
Micryphantes ccespitum, Koch, Uebers des Arachn. Syst., erstes Heft, p. 12. 
— — Kocb, Die Arachn., Band viii, p. 104, tab. 281, figs. 673, 674. 
Argus bicornis, Walck., Hist. Nat. des Insect. Apt., tom. ii, p. 36o. 
Length of the female, £th 0 f an inch ; length of the cephalo-thorax, ^th, breadth, 3 ',nd; 
