1896.] SPIDHRS rEOM THB LOWBH AMAZONS. 757 



than half a diameter from anterior laterals. Anterior laterals 

 ellipsoidal, their axes one-half longer than diameter of anterior 

 centrals. Posterior centrals smnllest, oval, less than their trans- 

 verse 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 ; faug-groove armed on inner side with 

 a series of 12 stout conical teetii ; 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 sepa- 

 rate 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 ante- 

 rior angle studded with a central longitudinal 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 struc- 

 tures, the " lyra " and the " pectan," together constitute the 

 s tridula ting-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., & ui. without spines. TibisB i. & ii. with one or two spines 

 beneath ; iii. with a double row of 3 — 3 on either side. Pro- 

 tarsi i. and ii. with 5 and 6 spines respectively beneath ; iii. with 

 numerous spines. (N.B. The number of spines on 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. 42— 

 ii. 38— iii. 38— iv. abest. Artl. i., long..4-8— 2— 9-5— 3-75— 8— 

 7-75 — 5. Artl. iv. long. : abest. Postr. mam. 17 long. Artl. 

 5 — 5 — 7 long. Antr. mam. 2-8 long., 2 sept. Mandib. 5 long. 



