64 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 10 



years. It will be observed that between September 12 to 16 there was 

 an emergence of 55 moths. After this it dropped off very abruptly. 

 93.3 per cent of the 1913 moths emerged from August 18 to Septem- 

 ber 16. 



After 1913. Unfortunately we have no complete records for the 

 years following 1913. The work was interfered with by other pro- 

 jects. A record on 75 moths for 1915, however, indicated a concen- 

 trated emergence from September 2-8. 



Taking the crest of emergence as the date when half of the insects 

 of that season had emerged, and this date coincided with remarkable 

 accuracy to the date when, as far as numbers go, the emergence is at 

 its zenith, we find that the crest for the different years at Fayetteville 

 was reached as indicated in the table below: 



It will be observed that there is a range of ten days for the crest of 

 emergence. The data of 1910, 1912 and 1913 was taken from the 

 same orchard, but the records of 1915 were made on the basis of seventy 

 five pupse collected before the date of maximum emergence, and bred 

 out in the insectary . 



A period of fifteen days on each side of the crest will embody the 

 period over which the maximum emergence takes place and during 

 which time from 60 to 93 per cent of the emergence takes place. If 

 the 1910 data be considered abnormal, it might be said that 75 per 

 cent or more will emerge during this period. 



Emergence at Different Points in the State. Limited data 

 were obtained to determine the difference in emergence at Fayette- 

 ville, latitude of 36° N., at an elevation of 1425 feet; at Abbott, lat- 

 itude 35° N., and elevation of 580 feet, and El Dorado, Ark., latitude 

 33° 10' N., with an elevation of 265 feet. 



El Dorado. Records from this place are by no means complete and 

 the data will need considerable reinforcement before we can have 

 anything conclusive. In these records pupse were collected just after 

 practically all of the worms had pupated and before emergence had 

 begun to any extent. The crest of emergence for 1914 on a basis 

 of 62 insects was on August 24, in 1915, on a basis of 69 insects, 

 it was August 26, and in 1916 on a basis of only 22 insects it was 

 August 22. 



The data at Abbott were procured in the same way as at El Dorado. 



