Studies in the Ecology of Forest Coleoptera.* Seral and Seasonal Succession of Coleoptera in the Chicago Area, With Observations on Certain Phases of Hibernation and Aggregation.

Abstract

The region in the vicinity of Chicago, Illinois has been deseribed previously by Salisbury and Alden (1899), Cowles (1901). Shelford (1913), and more recently by Fryxell (1927), among others. In general, Cowles noted (p. 8) that this area has “three great vegetation types: the mesophytic upland forests of the morainic clays, the hydrophytic lakes and swamps or mesophytic prairies of the Chicago plain, and the xerophytic forests of the dunes and beaches.”