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Psyche 
[Vol. 89 
Anterior median eyes their diameter apart, 0.3 diameters from later- 
als. Posterior median eyes slightly more than their diameter apart, 
their diameter from laterals. Total length, 3.2 mm. Carapace, 1.3 
mm long, 0.9 mm wide. First femur, 1.7 mm; patella and tibia, 1.7 
mm; metatarsus, 1.3 mm; tarsus, 0.8 mm. Second patella and tibia, 
1.4 mm; third, 1.1 mm; fourth, 1.5 mm. 
Male. Carapace, sternum orange. Legs yellow-white. Abdomen 
orange to black. Eyes subequal in size, spacing as in female. Total 
length, 2.3 mm. Carapace, 0.9 mm long, 0.6 mm wide. First femur, 
1.2 mm; patella and tibia, 1.3 mm; metatarsus, 0.8 mm; tarsus, 0.6 
mm. Second patella and tibia, 1.0 mm; third, 0.8 mm; fourth, 1.0 
mm. 
Diagnosis. Unlike A. jabaquara and A. dubiosus, Anelosimus 
saramacca has a short terminal embolus (Fig. 3). The female has an 
epigynum with a subtriangular depression enclosing a transverse 
mark; the openings appear posteriorly at the ends of the mark (Figs. 
L2). 
Natural History. A single colony of A. saramacca was found in an 
area of swampy lowland rainforest, approximately midway between 
Voltz Berg and Van Stockum Berg. The web was similar to that of 
Anelosimus eximius, but much smaller. It was located in a small 
sapling, about 30 cm above the ground. The web consisted of a 
nearly circular hammock or sheet of silk about 80 cm in diameter, 
and a pyramid shaped barrier web about 1 m tall. In the center of 
the hammock were retreats consisting of green leaves, some of 
which were curled. 
The colony contained at least 1000 individuals, including males, 
females and immatures. There were many more adult females than 
adult males. Large numbers of females with egg cases were found in 
the leaf retreats. A quick inspection revealed at least 140 females 
with egg cases. 
The egg cases closely resemble those of A. eximius and A. studiosus 
— they are pale brown, nearly spherical, and 1.5 mm in diameter. 
Several egg cases were collected, but many later proved to be empty 
or hatched out. Six egg cases containing eggs or embryos had a 
clutch size of 15.2 ± 1.8 eggs. 
Like A. eximius, A. saramacca shows cooperative behavior. Sev- 
eral adults and immatures were seen feeding together on large prey 
items, and the web appears to be a product of cooperative effort. 
