98 
Psyche 
[Vol. 92 
3. invicta 
summer 
R.H.100% 
N = 34 
X=28.3t1.6"C 
16 18 20 22 24 26 28 30 32 34 36 38 
TEMPERATURE °C 
14 - 
12 - 
i'.j im 
i i i i i i 
16 18 20 22 24 26 28 30 32 34 36 38 
TEMPERATURE °C 
■M-l S. aurea R.H.100°/o 
>- N=36 
y 12 - X=26.2±2 2°C 
16 18 20 22 24 26 28 30 32 34 36 38 
TEMPERATURE °C 
TEMPERATURE °C 
Fig. 2. Temperature preference responses of four species of fire ants ( Solenopsis 
invicta, S. aurca, S. geminata, and S. xvloni) and preference responses of S. invicta 
collected during different seasons (summer and winter); graphs on right represent 
responses at 0%, left represent responses at 100% relative humidities. When acclima- 
tion was significant, mean temperature preferences are given in Table 1. 
