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Show 1896.] SPIDERS P R O M T H E L O W E R A M A Z O N S . 757 than half a diameter from anterior laterals. Anterior laterals ellipsoidal, their axes one-half longer than diameter of anterior centrals. Posterior centrals smallest, oval, less than their transverse diameter from anterior centrals, only one-half the transverse diameter from posterior laterals. Posterior laterals ellipsoidal, their axes almost equal to diameter of anterior centrals ; less than half their transverse diameter from anterior laterals. Anterior row procurved. Mandibles parallel-sided; fang-groove armed on inner side with a series of 12 stout conical teeth ; floor studded with a single distinct row of 12 small cusps, diminishing in size towards the base, where are also numerous irregular small cusps. Outer margin fringed with thickly-set rufous hairs, four at the base being stouter and separate. Sternum a little longer than broad, smooth, set with black separate hairs; sigilla distinct, submarginal. Labium broader than long, convex, smooth, not studded with cusps ; set with long black bristles. Coxa of pedipalp twice as long as broad, its basal anterior angle studded with a central longitudiual area of small black cusps. Anterior apical angle very slightly produced, smooth. Tarsus not scopulate ; tarsal claw furnished with 6 denticles on the basal half beneath. Coxa of pedipalp furnished on the inner side, on the basal portion of the central ridge, with the " lyra," consisting of 5 stout curved spines; three curving hairs towards the anterior portion, and one small bristle towards the posterior portion of the ridge. These 5 spines strike on the four stout, separate, isolated bristles above mentioned as situated on the mandible, which together form the "pecten." These two structures, the " lyra" and the " pecten," together constitute the stridulating-organ. Legs long and slender. Femora i. and ii. without spines; iii. with a few spiniform bristles ; fourth pair of legs absent. Patella i., ii., & hi. without spines. Tibiae i. & ii. with one or two spines beneath; hi. with a double row of 3 - 3 on either side. Protarsi i. and ii. with 5 and 6 spines respectively beneath; iii. with numerous spines. (N.B. The number of spines ou the legs is not constant.) Tarsi with three claws, superior pair armed beneath with a double series of 5 - 6 denticles. Inferior claw long. Tarsi i. and ii. scopulate. Abdomen long-narrow. Spinners four. Posterior pair as long as abdomen, three-jointed ; basal equal in length to the second joint; terminal joint longer than the second. Anterior pair half as long as the basal joint of posterior pair, nearly the full length of one of them apart. Comparative measurements In millimetres.- 2 • Carap. 10 long., 8 lat. Abd. 17 long., 9 lat. Cephl. area 6*5 long. Stern. 5 long., 4 lat. Coxa of pedipalp 3-5 long., 2 lat. Pedes, long. i. 4 2 - ii. 38-hi. 38-iv. abest. Artl. i., long. 4 - 8 - 2 - 9 - 5 - 3 - 7 5 - 8- 7-75-5. Artl. iv. long.: abest. Postr. m a m . 17 long. Artl. 5 - 5 - 7 long. Antr. m a m . 2-8 long., 2 sept. Mandib. 5 long. |