40 
Psyche 
[Vol. 89 
zigzag loops of sticky silk, with some sticky silk laid directly on the 
radii. The radii are attached to the main eggsac radius or to the 
eggsac itself. One female had a three-dimensional eggsac web 
consisting of a rudimentary cone and inner orb radii (Fig. 7) with 
sticky silk in both the plane of the orb and the cone. Unlike the 
eggsac webs of Miagrammopes, these webs were retained both day 
and night. Insects that became entangled in the sticky threads were 
attacked in the usual manner. 
Females guarded their eggsacs (one per female) until the young 
emerged (13 days for one eggsac). Newly emerged spiderlings 
remained on the eggsac web for one or two days, then moved away 
and constructed typical Uloborus-type “baby webs”, consisting of 
radial threads connected by a thin sheet of very fine, non-sticky silk 
(Szlep, 1961; Eberhard, 1977b) without any cone. One immature, 
however, had an orb plus cone-web with a filmy “baby web” sheet 
where the rim sticky spiral would normally be found and also some 
“baby web” sheet on the cone. Structural spirals were present in the 
rim and inner orb; there was no sticky spiral. 
Uloborus bispiralis* 
The cone web of U. bispiralis (Fig. 8) is similar to that of U. conus 
in that the cone sticky spiral is continuous with that of the rim, and 
the outer loop(s) of rim spiral follow a zigzag path, with some sticky 
silk laid on the radii. Unlike webs of U. conus , the inner orb non- 
sticky spiral extends right up to the innermost (last) loop of rim 
sticky spiral and all webs had a few loops of sticky spiral in the inner 
orb. Most webs also had a thin, linear stabilimentum of white silk 
across the inner orb, with a spider-size gap at the hub. 
Webs of juvenile females were similar in all respects to those of 
adults. None of the webs observed showed signs of repairs. Like 
those of U. conus, they are probably renewed daily. On one 
occasion only, a juvenile female was seen hanging inside the cone 
while an adult male fed on prey at the hub. Another adult male was 
observed sitting at the edge of an adult female’s web and a third 
male was found sitting in a small cone-web (no sticky spiral was 
observed). 
This is a new species, described below. 
