1968] 
Leuthold. — Cremaiogaster 
343 
could be demonstrated by presenting the trail pheromone from 
crushed hind legs in front of a nest entrance. A new trail forking 
off from the old pathway gives the ant the choice to follow either 
the old or the new direction. The actual split ratio at such a fork, 
however, is not proportional to the strength of the trails. The old 
direction is characteristically always preferred. Deviations are still 
I 
2CH 
10 
Fig. 7. Food recruitment in a small colony. A food bridge and an ade- 
quate bridge without food but bearing a trail were joined opposite each 
other to the main bridge. Until time “a” (arrow) all ants were removed 
from the bridges. At time “b” the first recruiter ant arrived on the main 
bridge. 
A. Activity on the main bridge. Passages both ways counted in 2 min 
intervals. 
B. Number of ants passing towards the food. 
C. Number of ants going onto the trail bridge. 
Ci. The white columns show the calculated amount of ants which would 
go onto the trail bridge during the recruitment phase if it were pro- 
portional to the total increase of activity in A. The black tops give 
the actual numbers from C. 
