756 MR. F. 0, PICKARD CAMBRIDGE ON [June 16, 
row of teeth on the outer margin and a row of fine capsules wn centre 
of fang-groove. Tarsi i. and ii. distinctly scopulate, with central 
series of long sete. Cowa of pedipalp furnished with a lyra formed 
of 5 long, curved, claviform spines. Base of mandible with 4 isolated, 
incrassate bristles at the base. Diameter of anterior central eyes dis- 
tinctly less than awis of laterals. 
HARMONICON RUFESCENS, n. sp. (Plate XXXIII. figs. 3 & 6, 
and Plate XX XV. figs. 2 & 3.) 
Q. 27 mm. long. Type in coll. Brit. Mus. Nat. Hist. 
Hab. Santarem, Lower Amazons. 
@ .—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 
striz 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. Sternwm longer than broad. Sigilla well-marked : Ist 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. Tibie 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; pro- 
tarsus 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, slightly 
curving spine, directed outwards and backwards. Fang-groove with a single 
row of teeth on the outer margin. 
3.—Carapace 11 mm. long., 9°5 broad. Abdomen 12°5 mm. long. Man- 
dibles 5 mm. long. Post. spinners 9 mm. long. Legs, i. 55 mm. ; ii. 50 mm.; 
iii. 45 mm. ; iv. 58 mm. 
Q (immature).—Colours and general characters the same as of the G. 
Diameter of anterior central eyes less than axis of laterals, thus differing from 
the male, the difference being possibly due to immaturity. 
These specimens were kindly submitted to me by my friend Prof. Kulezynski, 
of Cracow. They were taken by Dr. Constantine Jelski in Peru. 
A. Coxa of pedipalp and base of mandible with stridu- 
lating-organs. 
1. Tarsal scopula without central series of long sete .... Trechona, O. K. 
2. Tarsal scopula with central series of long setz. 
a. Legs long, slender. Terminal segment of posterior 
pair of spinners longer than either of the basals . Harmonicon, n. g. 
b. Legs short, stout. Al three segments of posterior 
air of spinners subequal...............se:seceeseesees Melodeus, n. g. 
B. Ooxa of pedipalp and base of mandible without stridu- 
lating-Organs .....ecssssssssessesseceetsceecssesseecssssceeseee  Weodiplura, 0. g. 
