1896.] SPIDERS FROM THE LOWER AMAZONS. 733 



ACANTHODON BAUTARBMIA, n. sp. (Plate XXXIV. fig. 13.) 

 2 . Ilah. Santarem, Lower Amazons. 16 mm. long. Type in 

 coll. Brit. Mus. JSTat. Hist. 



$ . — Colour. Carnpace 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 liairs ; 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 1 1 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 stiif, black, 

 scattered hairs. Sigilla i., ii., and iii. present ; the first two mar- 

 ginal 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 iirst 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 two minute cusps onl}' on 

 outer margin. Protarsus ii. with numerous cusps on tlie 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. Tibiae 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 



