1988] 
Binder— Aggression in Heterotermes 
127 
Figure 2. Heterotermes aureus encounters in an arena. The horizontal axis 
represents increase in arena size (cm 2 ). Vertical lines on each column represent stand- 
ard error, a) Intracolonial (hatched) vs intercolonial (solid) mean number of 
encounters per minute, b) Mean time soldiers require to inflict fatal snaps on alien 
workers (seconds), c) Percentage of soldier encounters following a fatal snap against 
a worker, d) Mean number of snaps a soldier requires to inflict a fatal snap on a 
worker. 
