342 
Psyche 
[December 
Fig. 4. Rhythms of female and of workers, with persistence in femiale. 
Open bars show hours of light on last days of LD (Mar. 13-14) ; DD 
thereafter. FEMALE: Same ant as in Fig. 3; Tunnel Count per hour (2- 
hr ave) (histogram), and Activity Index (2, active; 1, walking or other 
moving; 0, quiet); note prominent morning drop in activity, and per- 
sistence in DD. WORKERS: One group of 10 in a 2-chambered nest; 
Activity Index (4, very active; 3, active; 2, moderately active; 1, slow; 
0, quiet) ; note high activity level through day and low at night, and seem- 
ing lack of persistence in DD (ants plugged connecting tube with cotton 
March 18, preventing record then). 
