554 On some Genera of S.-American Aviculariide. 
basal prominence, and with spine slender and apically pointed. 
Coxa of first leg clothed in front with simple slender bristles 
intermixed with erect pin-like hairs, of trochanter covered 
with slender ragged bristles; coxa of palp naked throughout 
its median length behind, the trochanter without scopula. 
Type Plesiopelma myodes, sp. n. 
Plesiopelma myodes, sp. n. 
g .—Prevailing colour black, hairy clothing olive-brown 
with silky-golden lustre, legs indistinctly banded longitu- 
dinally above. 
Carapace low, longer than wide, as long as patella and 
tibia of second leg, a little shorter than those of fourth, con- 
siderably shorter than those of first, slightly longer than 
protarsus and tarsus of first, than protarsus and half the 
tarsus of the fourth, and than patella, tibia, and tarsus of the 
palp ; length from fovea equal to tibia of fourth or of first. 
Hyes of anterior line large, laterals larger than medians ; 
medians considerably less than a diameter from each other 
and from the laterals. 
Legs 4, 1, 2, 3, fourth a little more than three times as 
long as the carapace, not so thick as the first; tibia of first 
armed with two internal and about four inferior spines, its 
protarsus scopulate to base, but not spinous proximally ; 
protarsus of second with about three strong spines at base of 
scopula; protarsus of third with more than its lower half, 
of fourth with its lower half scopulate. Upper tibial spur 
of first leg short, cylindrical, with long inferior spine, lower 
spur stout, not strongly arcuate, with short apical spine ; 
protarsus not arched, with external basal nodule. ‘Tibia of 
alp with one inner spine; palpal organ with spine stout at 
base, filiform at apex, with a slight spiral curvature and two 
strong keels. Basal segment of palp and first leg clothed 
with simple hairs. 
Measurements in millimetres.—Total length 26; length of 
earapace 13, width 11; length from fovea 8 ; length of first lee 
39, second 36, third 32, fourth 41; patella+ tibia of first 15, 
of fourth 18°5; protarsus of fourth 9:5. 
Loc. Uruguay. 
Genus ACENTROPELMA, nov. 
Resembling Metriopelma, but with the anterior side of the 
trochanter and femur of the first lez and the posterior side of 
the trochanter of the palp covered with a scopula of relatively 
stout delicately plumose bristles. 
