390 



JOURNAL OF ECONOMIC ENTOMOLOGY 



[Vol. 6 



larval emergence and work, pupation, and emergence of adults have 

 never seemed absolutely conclusive. 



Sources of Material Used 



Table Showing the Transformation of the LARViB Collected Dchino June, Jiilt, August, Seftembek, 

 October and November, 1911. 



Number 



85 

 196 

 371 

 359 

 140 



Larvic collected during 



June 1911 



July 1911 



August 1911. .. 

 September 1911 

 October 1911.. 

 November 1911 



Number which i Number which '. Number that 

 pupated in 1911 I pupated in 1912 died 











48 



145 



6 



17 



55 



226 



261 



125 



More than 800 larvse emerging during the late summer and fall of 

 1911 were enclosed in cotton-plugged glass vials and stored as the 

 weather grew cold in a box 20 inches below the surface of the ground. 

 In this box they were adequately protected from moisture. Forty- 

 eight larvse were collected from the trunks of apple trees on March 

 29, 1912, and enclosed in vials in a similar manner. 



Pupation in the first group reached the maximum by or before May 

 7, 1912 and ceased May 28, all that were alive transforming. Adult 

 moths began to emerge May 16, reached the maximum by May 27, 

 and ceased June 15. Pupation of the second group began April 15. 

 Adult moths began to emerge May 11, reached the maximum by May 

 23, and ceased by May 27. 



Breeding Cage Arrangements 



The first tree-cage consisted of ordinary screen wire tacked over a 

 wooden frame which was 18 feet square and 18 feet high. This cage 

 was set up May 15, 1912, over an unsprayed Jonathan, which stood 

 about 17^ feet high and filled the cage well. The tree was at once very 

 carefully gone over for eggs of the moth; but none were found, and the 

 trunk and larger branches were very carefully "wormed." 



The second tree-cage, made of similar size and of similar material, 

 was completed over another unsprayed Jonathan apple tree on June 

 1, 1912. The trunk and larger branches were carefully "wormed" 

 and all eggs and all wormy apples removed at intervals of a few days 

 to June 27. 



The third tree-cage was the first cage removed from the Jonathan 

 apple tree and placed over a Salome apple tree on July 27, 1912. The 



