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Show 1896.] SPIDERS FROM THE LOWER AMAZONS. 733 ACANTHODON SANTAREMIA, n. sp. (Plate XXXIV. fig. 13.) 2. Hab. Santarem, Lower Amazons. 16 m m . long. Type in coll. Brit. Mus. Nat. Hist. 2 .- Colour. Carapace dull orange-brown ; mandibles the same, darker towards apex. Sternum and legs also dull orange-brown ; tarsi slightly darker. Abdomen dull olive-brown ; spinners paler. Carapace a little longer than broad; cephalic area more than half as long as carapace ; strongly gibbous immediately in front of central fovea, slightly bilobate longitudinally, gradually depressed to margin of clypeus. Cephalic and thoracic indentations short but deeply impressed, especially the posterior pair. Central fovea deep, procurved. Margin of carapace raised and sinuous towards base, the latter truncate. Eyes in two separate groups. Anterior laterals circular, situated on a bilobate tubercle at the margin of the clypeus; less than half a diameter apart. Anterior centrals and posteriors situated on a low tumulus, two full diameters of the former behind the anterior laterals. Anterior centrals circular, half a diameter apart, not quite one diameter from lateral posteriors ; the latter ellipsoidal, very narrow, and pointed behind. Posterior centrals two full diameters apart, nearly one diameter from posterior laterals, half a diameter from anterior centrals. Posterior row only slightly procurved. Mandibles furnished with a rastellum formed of numerous stout conical teeth projecting beyond the apex. Fang-groove fringed on both sides with rufous hairs; inner margin armed with a row of eleven irregular stout teeth. Floor of fang-groove studded with a short row of five small teeth opposite nos. 7 and 11 of the inner row. Labium as broad as long, narrowed towards apex, bears two stout cusps situated transversely in the centre. Coxa of pedipalp double its breadth ; anterior apical angle slightly produced and armed with a cluster of 5 or 6 stout cusps. Anterior basal angle armed with a curving row of 5 or 6 cusps, while the whole inner surface is studded with numerous small cusps. Sternum longer than broad, convex, smooth, set with stiff, black, scattered hairs. Sigilla i., ii., and hi. present; the first two marginal and indistinct, the latter submarginal, distinct, and situate opposite the coxa of the second pair of legs. Legs 4, 1, 3, 2. Femora without spines ; tibia, protarsus, and tarsus of first pair armed with cusps on both sides, more numerous on the outer side. Tibia ii. armed with numerous cusps on inner margin only, with two long spines and tw?o minute cusps only on outer margin. Protarsus ii. with numerous cusps on the inner side; on the outer several cusps and three short, stout spines, in a longitudinal row, beneath. Tarsus ii. armed on both sides with cusps. Tibia? iii. and iv. without spines or cusps. Patella iii. with cusps on outer side ; protarsus iii. with spines and cusps, on either side, above; and below in a series of 2 - 2 - 2 . Tarsus iii. with a few short cusp-like spines on either side. Patella and |