1963] 
231 
Levi — Spider Genera 
Thwaitesia affinis O. P.-Cambridge 
Figures 14-19 
Thwaitesia affinis O. P.-Cambridge, 1882, Proc. Zool. Soc. London, 1882: 
431, pi. 31, figs. 8a, $, $. Female, male syntypes from the Amazon, 
in the Hope Department of Entomology, Oxford, examined. 
Thwaitesia adamaniifera Keyserling, 1884, Die Spinnen Amerikas, Theri- 
diidae, 2(1): 164, pi. 7, fig. 101 (in part) 9. Female lectotype here 
designated Maraynioc, [Junin], Peru in the Polish Academy of Sciences, 
Warsaw, examined. Male paratype from Minas Gerais [Brazil] in the 
O. P.-Cambridge collection in the Hope Department of Entomology, 
Oxford, examined. Female, male paratypes from Rio de Janeiro in the 
Keyserling collection in the British Museum, examined. NEW SYN- 
ONYMY. 
Description. Carapace, sternum and legs yellowish. Distal ends of 
tibiae brown. Abdomen yellowish with silvery spots on dorsum. 
Carapace with clypeus projecting. Eyes subequal in size. Anterior 
median eyes one diameter apart, almost touching laterals. Posterior 
median eyes one diameter apart, two-thirds diameter from laterals. 
Abdomen subtriangular (Fig. 15), male not as high (Fig. 14). 
Epigynum with an oval depression wider than long, a pocket on each 
side and openings apparently in center (Fig. 19). Palpus as illustrated 
by Figures 16, 17. Total length of female 4.5 mm. Carapace, 1.6 
mm long, 1.3 mm wide. First femur, 3.5 mm; patella and tibia, 3.6 
mm; metatarsus, 3.9 mm; tarsus, 0.7 mm. Second patella and tibia, 
2.1 mm; third, 1.2 mm; fourth, 3.2 mm. Total length of the male, 
2.7 mm. Carapace, 1.1 mm long, 1.0 mm wide. First femur, 3.5 mm; 
patella and tibia, 3.5 mm; metatarsus, 3.9 mm; tarsus, 0.7 mm. 
Map 2. Distribution of Thwaitesia affinis and T. hracteata. 
