Psyche 
[September 
182 
Figure 1. Generalized web structure of H. thorelli. S.S., substrate silk; 
L., lampshade; S.L., support line; F.L., frame line; T., tangle. Drawn 
from photos. 
The densest population observed was at Mull Creek, Jackson 
County, where 59 individuals were counted one day in June on a 
rock ledge approximately 15 m long and 1 to 3 m high. 
Petrunkevitch (1932) and Hoffman (1963) noted that >H. thorelli 
occurs in noticeably drier situations in the Cumberlands than in the 
Appalachians. J. Beatty (pers. comm.) says that the Alabama popu- 
lations of H. thorelli occupy moist sites when available, and he does 
not consider them abundant in drier situations. Perhaps, as he sug- 
gests, the Cumberland populations have a wider range of moisture 
tolerance than do the Appalachian populations. Hoffman (1963) 
and Shear (1970) noted that H. gertschi prefers drier situations 
than does H. thorelli , even though moist sites are available. 
Prey Capture 
TV eb construction . The web of Hypochilus is usually described 
(Comstock, 1940; Gertsch, 1958; Shear, 1970) as a “lampshade- 
shaped” mesh. The narrower inner end of the lampshade is at- 
