WALCKENAERA. 
299 
In May, 1834, an adult male Walckenaera flavipes was captured under the exfoliating 
bark of a sycamore at Crumpsall Hall, and in the spring of 1840 both sexes were met with 
under stones imbedded in the earth in a pasture at Oakland. 
Walckenaera turgida. PI. XX, fig. 214. 
Walckenaera turgida, Blackw., Linn. Trans., vol. xviii, p. 630. 
_ — Blackw., Annals and Mag, of Nat. Hist., second series, vol. ix, 
p. 274. 
Length of the female, T ’ ;j th of an inch; length of the ceplialo-thorax, /,th, breadth, ^th ; 
breadth of the abdomen, ^nd; length of an anterior leg, Ath; length of a leg of the third 
pair, Ath. 
The legs and palpi are robust, provided with hairs, and of a reddish-brown colour. 
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 cephalo-thorax is oval, convex, glossy, 
slightly prominent behind the eyes, with a small indentation in the medial line, and is oi a 
dark-brown colour. The falces are moderately strong, armed with teeth on the inner surface, 
inclined towards the sternum, and of a dark-brown hue, slightly tinged with red. The maxillae 
are somewhat lighter coloured than the falces. The sternum is broad, heart-shaped, convex, 
and, with the lip, has a dark-brown tint. The abdomen is oviform, convex above, projecting 
over the base of the cephalo-thorax ; it is thinly clothed with hairs, and of a brown colour ob¬ 
scurely mottled with darker brown; that of the branchial opercula being pale, yellov 7 ish-brown. 
The male is darker coloured than the female, and has a strong prominence on the 
anterior part of the cephalo-thorax, which is deeply indented on the sides. On this 
prominence the eyes are seated, and immediately before each eye of the superior pair there is 
a large, obtuse protuberance. The radial joint of the palpi is rather larger than the cubital, 
and projects a strong, bifid apophysis in front, having the process on the inner side longer 
and more pointed than that on the outer side; the digital joint is oval, convex and hairy 
externally, concave within, comprising the palpal organs, which are highly developed, 
prominent, complicated in structure, with a fine, curved spine at the extremity, and are of a 
red-brown colour. 
Specimens of this spider were discovered in the autumn of 1836 under stones and 
blocks of wood in the plantations at Crumpsall Hall. 
A suspicion is expressed by M. Walckenaer that Walckenaera turgida may be identical 
with Argusparallelus (‘ Hist. Nat. des Insect. Apt./ tom. iv, p. 508) ; but the males of these 
species exhibit differences in the form of the anterior part of the cephalo-thorax and in 
the disposition of the eyes. 
