154 REV. O, P. CAMBRIDGE ON THE GENUS IDIops. [ Mar. 10, 
Mazille strong, divergent, with a rudimentary point or promi- 
nence at their extremities on the inner side. ‘The /adium and 
sternum present no deviation from the normal structure. 
The abdomen is small, very convex above, and projects a little 
over the base of the cephalothorax ; it is of a deep but dull brown 
colour, and very sparingly furnished with hairs; the spiracular 
plates (four in number) are large, and similar to the legs in colour : 
the abdomen was a good deal shrunken in behind, so that it was 
not easy to get a full view of the spinners; but their number was 
four, and those of the superior pair appeared to be much longer 
and stronger than those of the inferior. 
The example (an adult female) from which the above description 
was made is in the British-Museum collection ; it was captured by 
the late Captain Speke (in East Africa) during his expedition to the 
sources of the Nile, and presented to the British Museum by Earl 
Russell. It is nearly allied to Idiops sigillatus, which it resembles 
in the general form of the palpi; but it may at once be distinguished 
from that genus by the entire absence of a spiny armature on the 
cephalothorax and abdomen, as well as by the want of the four 
peculiar seal-like markings so characteristic of the abdomen of J. sigil- 
latus. It is with a strong and grateful remembrance of past assist- 
ance in the study of Spiders, that I give to this species the name of 
Mr. Meade, of Bradford, Yorkshire. 
IpIops BLACKWALLIJ, n. sp. (Plate VIII. fig. 5.) 
Male adult: length 11 lines; length of cephalothorax 52 lines, 
breadth of cephalothorax 52 lines. 
This conspicuous Spider is of a deep black-brown colour, the 
cephalothorax and upperside of the abdomen being densely clothed 
with a silky adpressed pubescence of a silvery-white colour, offering 
a striking contrast to the dark (nearly black) colour of the legs 
and palpi; mingled with this pubescence, on the upperside of the 
abdomen, are hairs of a yellowish hue towards its fore part, and 
others of a brownish mouse-colour towards its hinder part : near the 
middle of the upperside there appeared to be a largish pale-yellow 
spot or patch; but this was not traceable with accuracy, owing to 
the shrunken state of the abdomen: the sides and under part melt 
gradually from the hue of the upperside into a deep mouse-brown : 
the spiracular plates (four in number, and glabrous) differ from each 
other in colour, those of the anterior pair being dark yellow- 
brown, while those of the posterior pair are of an orange-yellow 
colour. 
The cephalothoraz is depressed above (without any elevation of 
the occipital portion of the caput), and of a broad-oval form, nar- 
rowest in front, where it is less distinctly truncate, and proportion- 
ately rather narrower than in some other species; the hinder part 
is very broad, and indented on its posterior margin; the form of 
the cephalothorax is thus heart-shaped, blunt at its narrower end, 
and nearly resembles that of Idiops kochii. 
