OCR Text |
Show 1889.] REV. O. P. CAMBRIDGE ON NEW ARANEIDEA. 37 Genus IDIOPS, Perty. IDIOPS COLLETTI, sp. n. (Plate II. fig. 2.) Adult, female. Length 10| lines ; length of cephalothorax 4f lines; breadth of cephalothorax, at widest part, 3|. Cephalothorax longer than broad, the fore and hinder extremities equal in breadth ; thoracic indentation large, deep, curved, the convexity of the curve directed backwards; the occiput is very convex. The colour of the cephalothorax is pale yellow-brown, clothed with a few hairs, and two longish, erect, tapering bristles placed transversely just in front of the occipital convexity. The eyes of the anterior pair are close to the fore margin of the cephalothorax, rather large, and largest of the eight, oval, placed obliquely and separated from each other by less than half the longest diameter ; from between these two eyes spring one or two longish prominent black bristles. The four central eyes of the posterior group, which is separated from the anterior pair by nearly about double its longitudinal diameter, form a square, the foremost eyes being smallest; those of the posterior row, which are of about equal size, form a moderately curved transverse line whose convexity is directed backwards. The interval between the two central eyes of this row is distinctly greater than that which separates each from the lateral eye next to it; this latter interval is as nearly as possible equal to an eye's diameter. The ocular area forms (roughly) an equilateral triangle. The legs are short, stout, 4, 1, 2, 3 ; those of the third and fourth pairs considerably stoutest, furnished with hairs and spines; the latter are of different lengths and strength, many being small and of a denticulate nature, and are chiefly on each side of the tibise, metatarsi, and tarsi of the two anterior pairs; those on the third pair are chiefly on the upperside of the genuae, tibise, metatarsi, and tarsi, while on the fourth pair the spines are few and those mostly beneath the metatarsi and tarsi. The palpi are similar in colour to the legs, and armed as those of the first and second pairs. The falces are moderate in length and strength, of a darker hue than the cephalothorax, and armed with numerous strong short spines near the inner side of their fore extremity. Maxillee cylindrical and thickly covered on their anterior sides with small denticulations or spines. Labium somewhat quadrangular, broad at the base (broader than long), narrower at the apex, where there are a few small spinous denticulations, chiefly in a transverse row close to the margin. Sternum broadest behind, and longer than broad, incurved at its fore extremity, similar in colour to the cephalothorax. Abdomen dull clay-colour, thinly clothed with fine hairs of different lengths. Spinners 4, those of the superior pair short, 3-jointed, but very strong ; the inferior pair very small and close beneath the base of the upper ones. Two adult females of this spider were received from General |