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JOURNAL OF ECONOMIC ENTOMOLOGY 



[Vol. 10 



that a much larger proportion of females will be taken in collections 

 made during the evening and early night than will appear in the mate- 

 rial taken by a trap light run all night. 



In Chart A are tabulated the data obtained as to the effect of tem- 

 perature on the flight of these moths. We do not know what metero- 

 logical condition determines their attraction to light but we have 



Fig. 2, Chart B. Total collections for 1915, arranged by hours of collection. 



repeatedly noticed that it does not depend on temperature. If the 

 records listed in Chart A be ranked in order by the mean temperature 

 for the night it will quickly be seen that there is no correlation what- 

 ever between the temperature and the number of moths taken. We 

 have several times observed two successive nights closely similar as to 

 temperature and weather conditions, on one of which the moths 

 swarmed at lights and on the other, few or none appeared, although 



