1896.) | -—S- SPIDERS FROM THE LOWER AMAZONS, 737 
Genus AcANnTHOScURRIA, Ausserer, 1871. 
Syn. 1842. Mygale, C. Koch, Die Arachniden, ix. p. 43, fig. 718. 
1850. Seurria, C. Koch, Uebersicht, v. p. 74. 
Type. A. geniculata (C. K.), d. In coll. Imp. Mus. Berlin. 
Hab. America. 
Generic Characters. 
Legs spinose. Patella and tibia iv. shorter, or not longer than 
patella and tibiai. Tibia i. of 3 armed with a single spur at apex. 
Anterior row of eyes more or less slightly procurved. Femora iv. 
clothed on inner side with thick short soft hairs, forming a velvety 
pad. Sternal sigilla visible—1st pair at base of labium; 2nd 
marginal ; 3rd submarginal ; 4th remote from margin. 
ACANTHOSCURRIA GENICULATA (C. Koch). (Plate XXXIV. 
fig. 17.) 
Q. Hab, Santarem. In coll. Brit. Mus. Nat. Hist. 1896. 
Length 70 mm., including base of mandibles. 
2 .— Colour. Carapace mahcgany-brown, clothed with short grey 
velvety pubescence. Clypeus fringed with yellow-pink~ hairs. 
Mandibles black, clothed with short grey hairs and long rufous-pink 
hairs. Abdomen black, velvety, clothed with long rufous-pink 
hairs ; black, velvety, beneath. Sternum and coxew of legs deep 
black-brown. Coxz of pedipalp and labium pale red-brown; 
inner margins fringed with fiery-red hairs and long rufous hairs. 
Underside of legs black-brown, clothed with long rufous-pink hairs, 
the distal end of each segment fringed with cream-pink hairs. 
Upperside: femora black, with grey pubescence, outer side fringed 
with long rufous-pink hairs. Patella, tibia, and protarsus and 
tarsus of 1., 11, 11., iv. rich black-brown; the distal end of each 
segment and of the femur broadly tipped with short creamy-pink 
hairs, forming a richly contrasting annulation. Patella and 
tibia i. and ii, less so of iii. and iv., marked with a pair of 
longitudinal rufous-pink lines of short hairs. Protarsi i., i., iii., 
iv. with a short basal central rufous line. The pedipalp is similarly 
marked. ‘The legs are everywhere clothed with long silky rufous- 
pink hairs. 
Carapace 26 mm. long, 24 mm. broad ; gibbous behind eyes, 
with a depression on either side. Central fovea small, slightly 
recurved. Hye-tumulus longer than broad (more so than in 
A, brocklehursti). Centrals a full diameter apart, nearly a diameter 
from the laterals ; their diameter distinctly less than axis of anterior 
laterals. Anterior row of eyes more strongly procurved than in 
A, brocklehursti. Mandibles 15 mm. long. Fang short, only slightly 
incrassate in middle below; fang-groove armed with a single row 
of teeth on inner side, fringed on both margins with fiery-red hairs, 
thickly on outer side, more thinly e> inner side. Sternwn15 mm. 
long, 10 mm. broad; elongate\_val. Four pairs of sigilla visible : 
Ist at base of labial plate; 2nd marginal; 3rd submarginal; 4th 
