Genera of 8.-American Aviculariide. 549 
which proximally ends in a spot upon the posterior side of 
the segment. Abdomen covered with shortish rusty-red 
sete. Inferior surface of trunk and coxe black. 
Carapace long, distinctly longer than broad, its width just 
exceeding patella and tibia of second leg, its length consider- 
ably exceeding patella and tibia of first, the distance between 
the fovea and the anterior border exceeding the length of the 
fourth protarsus. Ocular tubercle moderately high, wider 
than long; anterior row of eyes slightly procurved, the 
anterior edge of the laterals being only very slightly in front 
of that of the medians, which are considerably larger; space 
between the latter about equal to a diameter, and a little 
greater than between median and lateral. The two laterals 
on each side subequal in size, space between them less than 
their long diameter. Legs 1 and 4, 3, 2; femora and patella 
of first and fourth equal in length. 
dS .—Considerably smaller than female, with longer legs 
and relatively wider carapace, the width just exceeding patella 
and tibia of third leg and considerably longer than protarsus 
of fourth, the length equal to patella and tibia of second leg; 
length from the fovea to the anterior border equal to the 
protarsus of the first. 
Spur on tibia of first leg a simple, short, blunt, spinulose 
process. Palpal organ very much like that of Avicularia 
avicularia, but the proximal half of the filiform portion less 
strongly curved, the whole terminal portion when seen from 
above presenting a slight and very open sigmoid curvature. 
Legs 4and 1,2, 3; patella and tibia of fourth slightly longer 
than of first. 
Measurements in millimetres.— ° . Yotal length 42, cara- 
pace 17, width of latter 14°8 ; length of first leg 49°5, of second 
45°5, of third 42, of fourth 49°5 ; patella + tibia of first 15°5, of 
fourth 15°5. ; 
3. Total length 28°5, carapace 13, width of latter 11°8; 
length of first leg 45, of second 41:5, of third 38, of fourth 
48 ; patella+tibia of first 14, of fourth 14°7. 
Loc. Brazil; Iguarassu (G. A. Ramage). 
Eight specimens of this species are in the British Museum 
collection, two adult males and six females, varying from 
15 up to about 40 millim. In young specimens the abdomen 
has a sharply-defined, median, black line and four large yellow 
spots on each side. 
Genus [RIDOPELMA, nov. 
Differs from Avicularia in having a spur on the tibia of 
