214 
ANNALS NEW YORK ACADEMY OF SCIENCES 
Legs 
Femur 
Pat. + Tib. 
Metatar. 
Tarsus 
Total 
I 
5.0 
5.2 
3.7 
1.3 
15.2 
II 
4.5 
4.5 
3.3 
1.2 
13.5 
III 
2.8 
2.4 
1.5 
0.8 
7.5 
IV 
6.6 
5.8 
4.2 
3.8 
17.9 
None of femora thickened; no tactile organs, only protuberances with hard bristles 
directed forward and a few irregular spines; similar spines found also on tibiae; 
side view of abdomen, Plate XXI, fig. 13; epigynum as in Plate XXI, fig. 12. 
Patria: Rio Uaupes, border between Colombia and Brazil. 
Collection: American Museum. Two mature females. 
13. Micrathena Vigorsi Perty (sub Aerosoma), Delectus Animalium quas 
in itinere etc, p. 194, pi. 38, fig. 8. 1833. 
Plate XXI, Figs. 16, 17, 18, 19. 
Cephalothorax, 5.0 long, 4.0 broad; abdomen (measured on back), 9.3 long, 6.2 
broad between second dorsal spines; clypeus, 0.30; diameter of eyes: AM, 0.160, 
AL, 0.140, PM, 0.182, PL, 0.140; distance between inside edges of AM, 0.168, of PM, 
0.280, of AL and PL, 0.070; distance between outside edge of PM and apex of angle 
formed by side eyes on each side of head, 0.77; quadrangulus a little broader than 
long, (0.644 broad, 0.602 long); legs in order 4123. 
Legs 
Femur 
Pat. + Tib. 
Meta tar. 
Tarsus 
Total 
I 
5.76 
5.76 
3.44 
1.36 
16.32 
II 
5.20 
4.96 
3.20 
1.28 
14.64 
III 
3.76 
3.20 
1.84 
1.12 
9.92 
IV 
6.96 
6.08 
4.00 
1.36 
18.32 
Tibiae and metatarsi with very few, weak spines. For figures of abdomen, sternum 
and epigynum, see Plate XXI, figs. 16, 17, 18, 19. 
Patria: Rio Uaupes, border between Colombia and Brazil. 
Collection: American Museum. Two mature females. 
14. Micrathena sordida Taezanovsky (sub Aerosoma), Hor. Soc. Ent. 
Ross., vol. ix, p. 13, pi. vi, figure 25. 1872. 
Plate XXI, Figs. 14, 15. 
Cephalothorax, 2.40 long, 2.24 broad; abdomen (measured on back), 5.20 long, 
6.96 broad between last spines; sternum, longer than broad (1.04 long, 0.72 broad); 
clypeus, 0.07; diameter of eyes: AM, 0.112, AL, 0.092, PM, 0.126, PL, 0.090; dis¬ 
tance be!ween inside edges of AM, 0.098, of PM, 0.140; side eyes contiguous; dis¬ 
tance between outside edge of PM and apex of angle formed by side eyes on each 
side of head, 0.490; quadrangulus almost square (0.364 long, 0.350 broad); legs in 
order 4123. 
