Fes., 1912. Mammars oF ILtinoris AND WISCONSIN — Cory. 39 
Transition Zone — This zone is characterized by comparatively few 
distinctive animals and plants, but covers a territory which repre- 
sents the southern limit of many northern species and the northern 
limit of many more southern species. 
Upper Austral, Lower Austral and Tropical Zones —In the Upper 
Austral Zone we find trees such as oaks, hickories, chestnuts, etc., 
in abundance, which are gradually succeeded by persimmons, mag- 
nolias, cyprus, etc.,in the Lower Austral Zone; and again by palms, 
bananas, etc., in the Tropical Zone, which in eastern United States 
is represented only in southern Florida. As with the plant life, 
there is a corresponding change in the fauna of these different zones, 
= 
—— F ——J 
Sass = Bareah enna? 
= = 14 Region , 
E : ==: e =| Canadian 
Transition 
x fae Upper Austral 
Lower Austral 
Tropical 
Region Tropical 
Map showing Life Zones in eastern North America, from Hudson Bay to the Gulf of Mexico. 
Copied from the U.S. Biological Survey's Fourth Provisional Zone Map of North America prepared 
by C. Hart Merriam, Vernon Bailey, E. W. Nelson, and E. A. Preble, 1910. 
