1982] 
Lubin, Opell, Eberhard, Levi — Uloboridae 
37 
section of the original orb containing the jagged sticky spiral (Fig. 
6c, d). This stage followed initial cone formation without interrup- 
tion, and it was difficult to determine when cone building ended and 
replacement and construction of new inner orb radii began. The 
spider went out to the cone along a temporary radius, broke the 
attachment to the cone and attached her dragline to the inner end of 
the temporary radius, then carried the radius upward by walking 
along radii and non-sticky spiral loops on the inner surface of the 
cone, and finally reattached it at or just inside (below) the innermost 
loop of the rim sticky spiral. She then walked back to the hub on the 
new radius, thereby doubling the thread. Upon reaching the center, 
she made attachments to form a new hub. The upper portion of the 
guy line was absent in finished webs, but it was not determined how 
it was removed. 
Additional new inner orb radii were constructed in much the 
same manner as “normal” orb radii. The spider went out on an 
existing radius (or temporary radius) with a dragline, reached the 
cone non-sticky spiral, walked across it to the next cone radius, 
attached the dragline to the cone radius just below (inside) the rim 
spiral, and return to the hub on the new radius (doubling it). 
Consecutive radii were always laid with angles of more than 90° 
between them, perhaps serving to reduce differences in tension on 
all sides of the orb (Eberhard, 1981). 
The last stages of web building, beginning with attachment of the 
dragline and ending with completion of the inner web, lasted 23 
min. 
Resting Postures 
The spider normally sat under the hub with legs I and II slightly 
flexed and holding separate radii. When disturbed, the spider 
adopted a cryptic posture with legs I and II held together and flexed 
and legs III and IV pressed close to the body (Figs. 2, 4). This 
posture was adopted either at the hub or under a short “dragline” 
thread beneath the hub, which was attached to the hub at one end 
and to a radius at the other. When disturbed repeatedly, or when 
sunlight struck the web and made it visible, the spider dropped from 
the hub onto the dragline thread and bounced up and down on it. 
Spiders also bounced while wrapping prey and sometimes while 
going out to attack an insect or upon returning to the hub. This 
