1985] 
Eberhard — Orb web of Eustala 
111 
Fig. 4. Web of Polenecia ( =Sybota ) producta (after Wiehle 1931). Thicker lines 
are sticky thread. 
sticky lines run along both radii and frame threads; the sticky lines 
on the radii are laid starting from the periphery and working 
inward; and the sticky lines on the radii extend to about where the 
temporary spiral crosses the radii. Wiehle’s description of building 
behavior suggests that just as in Eustala sp., Polenecia lays sticky 
silk on each radius in succession, and thus probably makes only one 
360° circuit of sticky silk construction before finishing. Major dif- 
ferences between Polenecia and Eustala sp. webs include Polenecia s 
lack of temporary spiral destruction (also occurs at least sometimes 
in the related uloborid Hyptiotes - Opell 1982 - Fig. 1; pers. obs.), 
periodic interruption of sticky line production (also occurs in Hyp- 
tiotes Wiehle 1927, Marples and Marples 1937), and a general lack 
of sticky lines spanning spaces between radii and frames. Polenecia 
is probably derived from an orb-spinning uloborid ancestor (Opell 
1979). Other Eustala species and species in related genera spin orbs 
