Figs. 1,2. Echinotheridion cartum. 1. Male, scale line 1.0 mm. 2. Left palpus, 
scale line 0.1 mm. 
The second unusual feature is the highly modified cymbium (Fig. 
2): two ends are drawn out into spines, while another side is pulled 
out and apparently supports the cymbium. Because the individual 
has only one palpus, I did not dissect or expand it, so the homology 
of the structures is not understood. An embolus can be seen below 
the lateral extension (on the right in Fig. 2). 
Unlike the female, the male has no spurs on the fourth coxae and 
has no other leg modifications. 
If the modified cymbium and the white mark above the spinnerets 
(Fig. 1) are synapomorphies, one must consider the genus related to 
Achaearanea and Tidarren. 
Psyche 
[Vol. 87 
Echinotheridion cartum Levi 
Figures 1 and 2 
Echinotheridion cartum Levi, 1963: 236, figs. 117-121, $, Map 3. Female holotype 
from Apa [River] Paraguay, 1908-1909 in the American Museum of Natural 
History. 
Description. Male. Carapace golden yellow with dusky marfcs, 
darker on sides. Sternum gray. Legs dusky light brown. Dorsum of 
abdomen with white pigment spots as in figure. Venter gray. 
Posterior eyes 0.5 diameters of anterior medians. Anterior laterals 
0.4 diameters of anterior median eyes. Anterior median eyes 0.6 
