456 REV. O. P. CAMBRIDGE ON NEW BRITISH SPIDERS. 
Falces strong, moderately long, straight, much inclined towards the maxillæ. 
Maxille moderately long, strong, inclined towards the labium, which is short and 
semicircular. 
Sternum broad, convex, heart-shaped, slightly hairy, and, with the labium, of a dark 
brown; the colour of the falces and maxillæ is like that of the legs. 
Abdomen oval, convex, projecting over the base of the cephalothorax, clothed with 
hairs, and of a shining brownish-black colour. | 
The female differs from the male in being rather larger but not longer, and in wanting 
the extreme cephalie elongation; her cephalic region is gibbous at the hinder part, and 
is succeeded backwards by a strong depression; her sexual organs are not very pro- 
minent; they are of a red-brown colour, and surrounded with a pallid line; the spinners 
are of the same colour as the legs in both sexes. | 
I captured adult males and females of this Spider under decayed rubbish in a swamp 
at Bloxworth, in May 1863. It is closely allied to 77. cristata, but differs from that 
species in the position of the eyes and in the hind slope of the cephalic region (caput) 
being less abrupt; the segments of the caput also are less pointed and less conspicuously 
furnished with hairs; and the two species also differ in the form and structure of their 
respective palpi and palpal organs. W. permixta is also generally of a less deep colour 
than W. cristata. 
WALCKENAÉRA IMPLANA, n. sp. (Pl. 57. no. 41.) 
Male adult, length 7 of an inch. : 
Cephalothorax oval, rounded, and slightly narrowest in front ; normal grooves defined, 
but not strongly; caput elevated, sloping from the upper pair of eyes to the middle of 
the elypeus, which is prominent and almost circular in profile. The summit of the ele- 
vation slopes slightly backward; and the occiput is rounded; the hinder part of the ele- 
vation rises abruptly from the thorax; the height of the clypeus is greater than the 
length of the space occupied by the upper and lower central pairs of eyes: looked at 
from the front, the elevation is greater in breadth at its upper part than in the line of 
lower central pair of eyes; from each hind lateral eye a deep longitudinal excavation runs 
to the hinder part of the elevation comprising the area of the upper and lower central 
pairs of eyes; this portion is thickly furnished with short hairs, of which there are a few 
also behind the upper eyes on the frontal summit of the elevation. The colour of the 
cephalothorax is dark black-brown, its surface shining, although, except the elevation of 
the caput, minutely punctuose. j 
Eyes eight, in four pairs, small, one pair over the fore margin of the summit of the 
caput wide apart, separated by a space equal to at least two of the same eye’s diameters; 
another pair lower down, near together, on a common tubercle, but not contiguous, 
leaving the greatest length of the facial space below; the lateral pairs are a little below 
the line of the eyes of the lower central pair, and are placed obliquely ; all the eyes are 
on black spots; the space between each fore lateral eye and the eye of the upper pair on 
its side is less than that between the fore laterals themselves, by the distance between 
each fore lateral eye and that of the lower middle pair on its side. E SE 
