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THE CANADIAN ENTOMOLOGIST 



without finding another opportunity for continuing these observa- 

 tions, I have concluded to publish the results. First, I will give 

 the data obtained during August to show the ordinary course of 

 beach collecting (see accompanying table), and then I will add 

 notes on the more abundant species for the entire season. 



The shore of Lake Michigan at Lake Forest extends due north 

 and south; hence it is the east wind that deposits drifting insects 

 upon the beach. My observations show that the wind was E.-N.E. 

 when the greatest accumulations of insects occurred. Only once 

 (Monday, Aug. 27th) were there any deposits of insects upon the 

 beach while the wind was blowing from the westward, and at the 

 time of that observation the waves were still running in from 

 N.-N.E., whence the wind had recently shifted. 



A number of piers project from the shores, and in the lee of 

 these the flotsam gathers and slowly rotates in isolated broad 

 eddies. 



Condensed Record of Daily Observations. 



This flotsam often consists of nearly pure insect material. 

 The most characteristic constituents are the cast skins of may- 



