O^OOKiJ'® 
mm 
HUDSON 
W I 5 
noRT.n 
0/r M E X / 
pOR T ® 
JjM^/ Cj 
ABAS ® 0 
NICARAGUA 
85 ° 
BY 
Arctic zone 
Boreal I Hudsonian 
Region i 
Canadian 
Transition 
Region 1 \ Upper Austral 
Lower Austral 
Ketlm a ’' Tropical 
IT. S. Biological Survey 
Fourth Provisional 
ZONE MAP OF NORTH AMERICA 
C. Hart Merriam, Vernon Bailey, E. W\ Nelson, 
and E. A. Preble 
1910 
The dotted parts of the Austral Zones east of the Cheat Plains indicate the extent of the humid divi¬ 
sions of these Zones , known respectively as the AXleghanian , Carolinian , andAustroriparianFaunas . 
The und ottedp arts of thesame Zones are known asthe Transition , Upper Sonoran,and Lower Sonoran. 
75° 
80° 
