54 
Psyche 
[March 
between these ants. Ecological differences between the sympatric 
forms are reported above; at Binna Burra quadridentatus nests in 
logs and forages openly at night, while wheeleri nests under stones 
and apparently forages cryptically. Nothing is known of the behavior 
of self-colored quadridentatus and such information is required. 
Bicolored quadridentatus and ivheeieri are perhaps the most spectacu- 
larly colored members of their genus; their coincident distribution 
suggests that the causal factors producing their color patterns may 
be inter-related. The two “forms” of quadridentatus might prove 
ultimately to be good biological species, but even if this is the case, 
character displacement need not be rejected in explaining their color 
differences. These ants are worthy of much further study. 
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