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Show 756 MR. P. O. PICKARD CAMERIDGE O N [June 16 row of teeth on the outer margin and a row of fine capsules in centre of fang-groove. Tarsi i. and ii. distinctly scopulate, with central series of long setae. Coxa of pedipalp furnished with a lyra formed of 5 long, curved, clavlform spines. Base of mandible with 4 isolated incrassate bristles at the base. Diameter of anterior centred eyes distinctly less than axis of laterals. HARMONICON RUPESOENS, n. sp. (Plate XXXIII. figs. 3 & 6, and Plate X X X V . figs. 2 & 3.) $. 27 mm. long. Type in coll. Brit. Mus. Nat. Hist. Hab. Santarem, Lower Amazons. 2 •-Colour. Carapace dull orange, almost destitute of hairs and pubescence. Abdomen rufous, clothed with fine black hairs, more numerous in front; spinners rufous. Sternum and legs dull yellowish with brown shading, clothed with spines and short black hairs. Mandibles dull orange, clothed with black hairs. Carapace longer than broad. Cephalic area two-thirds the length of carapace. Central fovea only slightly recurved. Thoracic striae well-marked. Ocular tumulus slightly raised above the level of the carapace, three times as long transversely as wide. Anterior centrals circular, three-fourths of a diameter apart, less them. Sternum longer than broad. Sigilla well-marked: 1st pair very large at base of labial plate; 2nd submarginal; 3rd remote; 4th more remote; each opposite the coxa of one pair of legs. Labium broader than long, semicircular; apex not spinulose. Coxa of pedipalp twice its breadth, anterior distal angle not produced, anterior basal angle studded with numerous cuspules. Legs long, 4, 1, 2, 3. Tibia? and protarsi i. and ii. spinose beneath; iii. and iv. above and below. Tibia i. with a stout spur-like spine on outer side at apex; protarsus i. with a stout tubercle on outer side towards the base. Tarsi slender, flexuose, much curved ; protarsus i. thickly recurved. Tarsal claws 3 ; superiors armed with a double series of denticles. Posterior spinners shorter than abdomen, trisegmental, segments subequal. Anterior spinners within two diameters of each other. Pedipalp: tibia with long spines beneath, tarsus very short, bulb short piriform, its apex prolonged into a short, stout, simple, slighdy curving spine, directed outwards and backwards. Fang-groove with a single row of teeth on the outer margin. $.-Carapace 11 m m . long., 9'5 broad. Abdomen 12-5 m m . long. Mandibles 5 m m . long. Post, spinners 9 m m . long. Legs, i. 55 mm.; ii. 50 mm.; iii. 45 m m . ; iv. 53 m m . 2 (immature).-Colours and general characters the same as of the o*- Diameter of anterior central eyes less than axis of laterals, thus differing from the male, the difference being possibly due to immaturity. Tbese specimens were kindly submitted to m e by m y friend Prof. Kulczynski, of Cracow. They were taken by Dr. Constantine Jelski in Peru. A. Coxa of pedipalp and base of mandible with stridulating- organs. 1. Tarsal scopula without central series of long setae ... Trechona, 0. K 2. Tarsal scopula with central series of long setae. a. Legs long, slender. Terminal segment of posterior pair of spinners longer than either of the basals . Harmonicon, n. g. b. Legs short, stout. All three segments of posterior pair of spinners subequal Melodeus, n. g. B. Coxa of pedipalp and base of mandible without stridu-lating- organB Neodiplura, n. g. |