LYCOS A. 
31 
Lycosa fluviatilis. PI. II, fig. 13. 
Lycosci arenaria, Koch, Die Arachn., Band xv, p. 36, tab. 514, figs. 1441, 1442. 
— pallida, Blackw., Linn. Trans., vol. xix, p. 119. 
— — Blackw., Annals and Mag. of Nat. Hist., second series, vol. vii, 
p. 261. 
Length of the female, Aths of an inch ; length of the cephalo-thorax, 1th; breadth, T ' 5 th ; 
breadth of the abdomen, ^th; length of a posterior leg, |„ths; length of a leg of the third 
pair, fiths. 
The colour of the cephalo-thorax is dark-gray, tinged with yellow, the medial line, and 
margins being the palest. The falces are conical, armed with a few teeth on the inner 
surface, and of a reddish-brown colour. The sternum is heart-shaped, of a very dark-brown 
hue, and is sparingly covered with whitish hairs. The maxillae have a pale, reddish-brown 
tint; and the lip has a dark-brown hue. The legs and palpi are of a yellowish-brown colour, 
with obscure annuli and spots of a dark-brown hue, and are provided with hairs and long 
spines. The abdomen is hairy, rather broader at the posterior than at the anterior extremity, 
convex above, projecting over the base of the cephalo-thorax, and is of a yellowish-gray 
colour, the under part being the palest; in front of the upper part there is a large black spot, 
immediately above and on each side of which there is a small tuft of whitish hairs; behind 
the central tuft there is a short, pale, yellowish-gray band, and a series of irregular black 
spots occurs on each side of the medial line, alternating with which are minute whitish spots 
formed by the extremities of obscure, curved lines, occupying the space comprised between these 
series; the branchial opercula have a dark-brown hue. 
The male is considerably smaller and darker coloured than the female ; its legs are less 
distinctly marked with annuli, and the tarsi of the anterior pair have a brownish-black hue. 
The colour of the cephalo-thorax is brownish-black, with a narrow band of whitish hairs 
extending along the middle, and an obscure one of the same hue on each lateral margin. The 
falces are of a dark, reddish-brown colour, and the maxillae and lip are almost black. The 
palpi are black; the cubital and radial joints are short, the latter, which is the stronger, 
being abundantly provided with black hairs; the digital joint is oval, convex, and hairy 
externally, concave within, except at the extremity, comprising the palpal organs, which are 
highly developed, with a prominent, slightly curved process directed forwards, and are of a 
very dark-brown colour, tinged with red. 
This is a common spider on the banks of rivers in Denbighshire and Caernarvonshire. It 
pairs in May, and in June the female deposits about sixty pale-yellow eggs, of a spherical 
figure, in a lenticular cocoon of dull-green or yellowish-brown silk, of a compact texture, 
measuring one fifth of an inch in diameter. 
