68 
Psyche 
[Vol. 89 
15 -« 
CO 
LU 
O 
CD 
CD 
CD 
10 - 
t — i — i — i — r 
1 2 9 8 16 32 
NO, WORKERS PER COLONY 
Fig. 2. — Frequency distribution of colony sizes for 35 nests. 
nies collected in late August which reared brood in the laboratory, 
the ratio of <5:$: $ ? was as follows: 2:1:36; 0:5:13; 3:0:7; and 0:4:19. 
In all cases the worker population of a colony was at a maximum at 
this time. If this is considered in conjunction with the available 
information on nuptial flights in A. pallipes, then it is possible to 
speculate on colony reproduction and population structure. 
