CHART   O    Gb. 
 
nuLUCIATION IN RMUATIOI7 TO RAWI BMM~LAR 
 
 
   rireient range boundary 
- Original range boundary 
    Territory believed to exibit 
        the saturation point 
0   Territory exhibiting irruptions 
o   Sporadic invasions of new territory 
 
 
and central 
 
 
w Present range boundary 
Orig  rl ange boundary 
Present range 
AG"ired range 
STerritory known to exibit 
    fluctuation 
 
 
 
 
rth Central States, showing 
pheral fluctuations