WALCKENAERA. 
303 
Length of the male, -nth of an inch ; length of the cephalo-thorax, ^th, breadth, ^th; 
breadth of the abdomen, ^th; length of an anterior leg, <‘th; length of a leg of the third 
pair, nth. 
On the anterior part of the cephalo-thorax, which is compressed, there is a large, per¬ 
pendicular, obtuse prominence, divided into two lobes at the summit by a longitudinal furrow; 
the posterior part is depressed, and the frontal margin is very prominent; the falces are small, 
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 have a dark-brown tint, the lip and frontal prominence 
of the cephalo-thorax being the darkest. The legs are provided with hairs, and have a yel¬ 
lowish-red hue; the two superior tarsal claws are curved and pectinated, and the inferior one 
is inflected near its base. Four eyes, situated on the anterior part of the frontal prominence, 
form a square ; the two superior ones are seated on a minute tubercle, and the inferior ones 
are the smallest of the eight; the other four are disposed in pairs on the sides of the pro¬ 
minence, near the front, those of each pair being contiguous. The palpi resemble the legs in 
colour; the radial joint, which is much shorter than the cubital, projects a small, slightly 
curved apophysis from its extremity, on the outer side; the digital joint is oval, convex and 
hairy externally, with an indentation at its base, on the outer side; it is concave within, com¬ 
prising the palpal organs, which are highly developed, complicated in structure, with a curved, 
black spine at the extremity, enveloped in membrane, and are of a reddish-brown hue. The 
abdomen is oviform, convex above, projecting over the base of the cephalo-thorax; it is thinly 
clothed with hairs, glossy, and of a dark-brown colour, that of the branchial opercula being 
dull-yellow. 
Mr. T. Glover captured an adult male of this rare spider in June, 1838, among coarse 
herbage in Gwydyr Wood, near Bettws y Coed, Caernarvonshire. 
Walckenaera bicolor. 
Walckenaera bicolor, Blackw., Linn. Trans., vol. xviii, p. 635. 
— — Blackw., Annals and Mag. of Nat. Hist., second series, vol. ix, 
p. 464. 
Length of the male, ^th of an inch; length of the cephalo-thorax, ^nd, breadth, 3 |th; 
breadth of the abdomen, 3 ',nd; length of an anterior leg, T \th; length of a leg of the third 
pair, T ' B th. 
The cephalo-thorax is oval, convex, glossy, prominent but obtuse before, with an indenta¬ 
tion immediately behind each lateral pair of eyes, and a slight one in the medial line; the falces 
are conical, armed with teeth on the inner surface, and inclined towards the sternum, which is 
broad and heart-shaped; the legs and palpi are moderately robust, and are provided with 
hairs. These parts, with the maxillae and lip, have a brown hue, the lip being the darkest 
40 
