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Show 1873.] GENERA AND SPECIES OF ARANEIDEA. 119 gitudinal rows of long strong sessile ones occupy the undersides of tibiae and metatarsi, chiefly of the first two pairs; underneath the tibiae and metatarsi of the fourth pair is a peculiar row of close-set spine-like bristles of uniform length. Each tarsus terminates with three curved claws, the superior ones much the strongest, and pectinated about the middle, the inferior claw simple and strongly bent downwards. Palpi moderately long and strong, furnished with hairs and spiny bristles of considerable length, chiefly on the radial and digital joints, the latter also terminating with a curved claw. Falces long and strong, profile-line rounded. Maxillae and labium (see characters of genus). Sternum oval, pointed behind. Abdomen elongate-oblong, rather broader before than behind, constricted laterally about the middle and again near the spinners ; its colour is yellow, marked on the upperside, chiefly in the constrictions, with brownish red. An elongate somewhat diamond-shaped longitudinal marking, sharp-pointed at its hinder extremity and truncate before, occupies the central line of the fore half of the upper-side ; this marking is of a dull opaque yellowish brown colour ; and from the slightly angular point on either of its sides is a short line directed backward on each side also ; but nearer the fore extremity of the abdomen is a small punctured dot; and following the hinder point of the above marking and almost close to it are two small red-brown elongate dots in a transverse line ; the upper surface is very sparingly clothed with short fine hairs; but underneath near the spinners are some long prominent slender ones. Spinners 6 (?), prominent, but moderate in length and strength; those of the superior pair are two-jointed, those of the inferior pair rather shorter but stronger and one-jointed. Genital aperture duplex, and with a shining black margin; its form is peculiar (see fig. 3, /, Plate XII.). A single adult female example of this Spider was found by Mr. William Rogers (son of Mr. Henry Rogers, of Freshwater, Isle of Wight) on the Rio Grande, Brazil, and was forwarded to me in • August 1872. Although presenting a very Thomisiform appearance, it has evidently a closer affinity in some respects to the Lycosides, and in others to the Agelenides ; its nearest congeneric allies are probably the curious genus Podophthalma (F. de B. Capello) and Triclaria (C. Koch) ; but the position of its eyes and other characters preclude its being included in either of those genera, with which, however, I think it must be united in the family Podopthalmides, already formed, in an M S . scheme, to receive Capello's genus. Fam. THOMISIDES. Genus T H O M I S U S (Bl.). T H O M I S U S PROSPER, sp. n. (Plate XIII. fig. 4.) Female adult, length 3% lines. The cephalothorax of this Spider is of a peculiar form; and its profile-line forms a strong and equal curve; when looked at from |