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Show 428 REV. O. P. CAMBRIDGE ON N E W ARANEIDEA. [May 16, Genus SPHECOZONE ', Cambr. S P H E C O Z O N E NIGRA, sp. n. (Plate X X I X . fig. 4.) Adult male, length 1 line. The whole of the fore part of this Spider is deep brown-black, the falces and the extremities of the legs being rather the brownest; and the abdomen is black. The general form and structural characters are very similar to those of S. rubescens, Cambr., the type of the genus ; the Spider, however, is smaller, and differs totally in colours and in the structure of the palpal organs. Several bristly hairs spring from the upper-side of the caput, some from the ocular area curving towards and meeting others (stronger ones) curving towards them from the occiput. The palpi are of moderate length; the radial joint is of a somewhat similar cup-shape to that of S. rubescens, but not nearly so large or developed; the fore extremity on the upperside i3 produced and prominent, terminating in a bifid form. The digital joint is large and oval, but rather strongly and irregularly indented on the outer side towards its base. The palpal organs are highly developed, prominent and complex, consisting of several very marked corneous spines and processes; one of the spines is of very great length, black, slender, tortuous and convoluted, ending in a long hair-like point, Received in Mr. Traill's Amazon collection. ACH^EA, g. n. The little Spider on which this genus is based is closely allied to Theridion, Walck. ; but the large size and prominence of the fore central pair of eyes, as well as the obtusely humped posterior extremity of the abdomen, appear to exclude it from that genus. The eyes also (among other characters) separate it from Thwaitesia, Cambr., and Chrysso, ejusd. In the only example examined the legs of the fourth (or posterior) pair were wanting; but from the lengths and proportions of the three other pairs I should judge their relative lengths to be 1, 4, 2, 3. The legs are rather slender and tolerably long, furnished with hairs only, excepting three or four spines beneath the femora of those of the first and second pairs ; each tarsus ends with three claws. Maxilla and labium as in Theridion. Cephalothorax short and broad, with little or no lateral marginal constriction at the caput. Abdomen short, somewhat cylindric in form, bluntly produced, but not to any great extent, at its posterior extremity on the upper-side ; probably the female would present this character in a much stronger degree. AcHiEA INSIGNIS, sp. n. (Plate XXX. fig. 5.) Adult male, length 1 line. The whole of the fore part of this Spider is of a clear reddish P. Z. S. 1870, p. 733, pl. xliv. fig. 3. |