274 
Psyche 
[September-December 
Fig. 1. Adult female Mallos trivittatus (body length: 7 mm) at East Turkey 
Creek (Chiracahua Mountains, Arizona) feeding on tipulid fly. Fly grasped at 
ventral thorax. 
The tipulid flew in circles continuously for 10 min while I observed, 
after which I collected the fly and the spider. Of the set of M. tri- 
vitattus observed feeding in nature, 9% were on extension lines at 
the time; and 5% of the arthropod carcasses found in webs of M. 
trivittatus were found on extension lines. M. gregalis webs also 
have extension lines, and these spiders sometimes fed on flies caught 
on extension lines. 
