1870.]| REV. O. P. CAMBRIDGE ON THE GENUS IDIOPS. 155 
The eyes are situated upon a single oval tubercular elevation, im- 
mediately above the fore margin of the caput. This elevation is 
furnished with some strong, curved, spine-like bristles before and 
behind. The grouping of the eyes is normal, though more com- 
pact than in Idiops meadii and JI. sigillatus: the two forming the 
foremost row are close above the fore margin of the caput: those of 
the second row (also two in number) are the largest of the eight, 
and seated on the summit of the elevation; they are nearer to- 
gether, though forming a rather longer row that the two foremost 
eyes: those of the third (or hinder) row are four in number, and 
small; they form two pairs, a pair occupying each extremity of the 
row ; the eyes of each of these pairs are contiguous to each other, 
thus leaving a wide interval between the two pairs: those of the 
first and second rows form nearly a square, whose transverse dia- 
meter is rather shorter than its longitudinal, and its fore side the 
shortest. 
The legs are very strong, and moderately long, their relative 
length being 4, 1, 2, 3; the difference between 1, 2, and 3 is slight ; 
the actual lengths of 4 and 1 are 20 and 15 lines respectively : they 
are thickly clothed with brown-black hairs and inconspicuous 
spines: the metatarsi and tarsi are furnished beneath with pads of 
close-set hairs ; those on the tarsi are peculiarly arranged, leaving a 
longish narrow oval hollow along the centre of the pad: the tibiee 
of the first pair are armed at their extremity, rather underneath on 
the inner side, with a strong, curved, corneous projection, termina- 
ting with spiny bristles and sharp tooth-like spines ; just above this 
projection is a short, strongish, tooth-like spine, which in this 
species occupies a position similar to that occupied in Idiops meadii 
by a second corneous process. 
The palpi are moderately long, strong, and furnished, like the 
legs, with hairs and spines: the radial joint is longer, but not 
stronger than the eudztal ; it is furnished thickly, and very conspicu- 
ously beneath, with long hairs and spines: the digital jot has a 
pad or tuft of close-set hairs at its extremity ; and the palpal organs 
consist of a nearly circular corneous bulb, prolonged in a slightly 
tortuous form, and terminating with two points, of which one is 
longer than the other and curved. These organs bear considerable 
resemblance to those of Dysdera erythrina (Walck.). 
The falces have their profile abruptly curved; they are promi- 
nent, but moderate in length and strength, of a dark colour, and 
thickly furnished with mouse-grey hairs, among which are a few of 
a blackish hue ; the extremities have no spines on their uppersides ; 
and the hairs are so arranged as to form, with the dark ground, 
longitudinal bands or stripes. 
The mazille are long and cylindrical, but have a protuberant 
point at their inner extremities; they are furnished on the inner 
sides with a fringe of strong bright-reddish hairs. 
Labium small, oblong, rounded at its apex. 
Sternum small, narrow-oval, very little wider behind than before, 
