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JOURNAL OF ECONOMIC ENTOMOLOGY 



[Vol. 4 



period determined for all weevils emerging between the extreme dates. 

 For the' first period, ten days ending July 17, the average period 

 was 14.25 days; second period, ten days ending July 27, 13.9 days; 

 third period, ten days ending August 6, 13.54 days; fourth period, 

 ten days ending August 16, 12.92 days; fifth period, six days ending 

 August 22, 13.48 days; sixth period, ten days ending September 

 11, 14.0 days; seventh period, ten days ending September 21, 15.31 

 days; and eighth period, eight days ending September 29, 15.97 days. 

 The weighted average daily, periodic, and seasonal developmental 

 periods are shown in Table VIII. 



TABLE VIII 



WEIGHTED AVERAGE DAILY, PERIODIC, AND SEASONAL DEVELOPMENTAL PERIODS 



The method of obtaining the average temperatures used to show the 

 effect of this factor on the duration of the developmental period was 

 as follows: all recorded maximum, minimum, and mean temperatures 

 from the average date of oviposition to the average date of emergence 



