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Show 734 REV. O. P. CAMBRIDGE ON NEW ARANEIDEA. [Nov. I, joint springing from the centre of its hollow ; this latter (digital) joint is large and of oval form, with an elongation behind, by which it seems to adhere to the radial joint. The palpal organs are well developed, but not very complex; they consist of two largish lobes, with one or two corneous processes or spines at their extremity. The falces are moderately long and strong, a little divergent at their extremities, enlarged or prominent in front on the outer sides; they terminate with a not very strong curved fang, and are armed with several sharp teeth near their extremities on the inner side. Sternum broad, convex, heart-shaped, and glossy, furnished with a few longish erect bristly black hairs. The adult female is larger than the male, but resembles it in colour, excepting the dark caput, falces, and maxillae ; the epigyne is also of a deep reddish brown, nearly black. Two adult females and an adult male of this Spider were lately received from near Sta. Fe, Minas Geraes, Brazil, where they were captured by Mr. Henry Rogers. Had it not been for the excessive slenderness of the legs, and the distinct joint or petiole by which the cephalothorax and abdomen are connected, this species could hardly have been excluded from the genus Erigone (Savig.), to which in other respects it bears the closest resemblance. Tt must be exceedingly Ant-like when alive ; and in general form it bears considerable resemblance to certain of the genus Micaria (fam. Drassides) ; but the difference in the form of the caput and other characters separate it easily from that genus. It is evidently allied to " Formicina" (Canestrini), but differs in the petiole and relative lengths of the legs, as well as in other particulars. As far as my own experience goes, this Spider is more nearly allied to the almost exclusively northern genus Erigone than any other known tropical Spider; and possibly it may prove to be the type of a more or less numerous closely allied exotic group. Its bright colours contrasted with the black caput and tip of the abdomen, together with its slender legs and waist, make it a very striking and pretty species. Nov. gen. CEPHALOBARES (KecpuXi), head, fiapiis, heavy). Characters of the Genus.-Cephalothorax short, nearly round at its lower margins; caput large, abnormally elevated and convex, rounded on all sides, and projecting greatly over the falces. Eyes not very unequal in size, forming four pairs on the fore part of the caput; the four centrals form a large square, whose fore side is the shortest; and on either side of the lower part of the square are the two lateral pairs, the eyes of each of which are contiguous to each other, and seated on a very slight tubercle. Legs short, moderately strong, not greatly unequal in length ; relatively 1, 4, 2, 3 ; the tarsal claws three iu number and very minute. Falces small, moderately long, straight. Maxillee moderate in length and strength, slightly inclined to the |