1970] 
Holldobler & Wilson — Recruitment Trails 
393 
Fig. 6a. The progress of recruitment and foraging activity at insect 
prey (the cockroach Nauphoeta cinerea). Above: Total number of ants 
in the arena. Belov:: Ants returning to the nest. O — sting extruded, no 
food; • =: sting extruded, with food; solid black triangle = sting not 
extruded, with food ; A =: sting not extruded, no food. 
Fig. 6b. The progress of recruitment and foraging activity at oak flakes 
at one spot. Details as in caption of fig. 6a. 
