188 THE CHICAGO ACADEMY OF SCIENCES. 
RANGE (figure 14): Northern New England (Vermont) west to 
Minnesota, lowa and Manitoba; northern Ohio, latitude 41°, north- 
ward in British America to north latitude 57°. 
Megasoma is confined to the Canadian and Hudsonian regions 
and the northern part of the Upper Mississippian region. It thus 
occupies the drainage areas of the St. Lawrence River, the Mississippi 
River and the waters of the western part of the Hudson Bay area. 
The center of distribution is the Great Lake region, from whence the 
species has spread to the areas east, west and north. The northward 
ope 
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Fic. 14. 
extension in Keewatin was made possible by the glacial Lake Agassiz 
via the Minnesota-Red River connection. The Ohio record is the most 
southern. 
Megasoma is essentially a boreal species, though extending into 
the transition life zone; the southern records in Ohio, Wisconsin and 
Iowa are at the southernmost extension of the Alleghanian division 
of the Transition zone, while the northern limit seems to be in the 
Hudsonian area of the Boreal zone. The range extends through the 
