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Show 322 REV. O. P. CAMBRIDGE ON SPIDERS [Apr. 20, two basal joints and the hinder extremity of the femora yellow, each one of the femora having a single annulus of the same colour. The tarsi are of a pale hue ; and all the legs are furnished with short fine hairs. The palpi are moderately long; the cubital joint is strong, somewhat clavate, and double the length of the radial, which is of a blunt-pointed form, and adheres closely to the base of the palpal organs ; the digital joints are large, of an oval form, with their convex sides directed towards each other; the palpal organs are compact, and not very complex. The falces are long, not very strong, but projecting forwards. The form of the maxilla, labium, and sternum is normal. The abdomen has its hinder extremity considerably produced into a large somewhat cylindrical prominence, rounded at its extremity ; it is of a dull clay-yellow hue, with a black spot at the end of the prominent portion, and another stronger one just above the spinners, which are placed about halfway between the fore and hinder extremity of the abdomen. Near the middle of the upperside are two silvery-white spots in a transverse line, and two others behind them, wider apart, one on each side of the produced portion. The female resembles the male in general colours and markings ; but the legs are shorter, the cephalothorax wants the elevated bilobed anterior part of the caput, and the abdomen is of a different shape, being gradually elevated to a great height, and forming, when looked at in profile, a nearly isosceles triangle whose base is much shorter than its sides. The silvery markings also on the abdomen are larger and more numerous, varying, however, a little in their size and form, that represented in figure lc showing their greatest extent. This pretty Spider is quasiparasitic, living in the webs of some Epeirid, though I do not know of what species. It appears to be an abundant species, numerous examples of both sexes having been sent to me at different times from Ceylon by Mr. G. H. K. Thwaites. ARGYRODES CONCINNA, sp. u. (Plate XXVIII. fig. 2.) Adult male, length to the spinners 11 line, and to the apex of the abdomen 2 lines. This species is allied to Argyrodes epeirce, Sim., but easily distinguishable by the form of the caput, and also by the form and pattern of the abdomen. The inferior lobe of the fore part of the caput is almost as strong as the superior one ; its extremity is rather upturned; and the cleft between the two is nearly obsolete, as, excepting at the base of the cleft, the two lobes are in contact with each other. The cephalothorax, legs, and palpi are yellow-brown. The legs are long and slender, 1,2, 4,3; those of the first pair exceed tbree times the length of the Spider itself; and the anterior part of the tibiae and femora of this pair is strongly suffused with dark reddish brown; their armature consists of fine hairs only. The palpi are very similar to those of A. epeirce ; but the structure of the palpal organ differs a little. |