1 66 



Journal of Agricultural Research 



Vol. XIII, No. 3 



Table VI. — Total number of flies emerged during the spring of iQiy from one heap of 

 horse manure to which infested bran was added 



' Species 



Total 

 number of 



flies 

 emerged. 



Period of emergence. 



Miisca domes tica 



Muscina assiviilis 



Muscina stabulans 



Ophyra leucostom.a 



Hydrotaea armipes Fallen 



Fannia canicularis 



Other species of Anthomyiidae 



Scatophaga stercoraria 



Scatophagaf areata 



April 30. 

 April 16 to 23. 

 May 14 to 21. 

 April 9 to 30. 

 April 9 to May 14. 

 April 16 to May 21. 

 April 16 to 30. 

 March 22 to April 30. 

 April 9 to May 14. 



The single specimen of Musca domestica taken from the trap on April 

 30 was plainly freshly emerged, having bright colors, soft body, and 

 ptilinum not fully retracted. 



Two other experiments were conducted in the same way as the one just 

 described except that no bran with larvae was added at any time, and 

 therefore no larvae were introduced after October 24. The manure 

 added after this date was not infested. From November 13 to December 

 II, 1 91 6, the following flies emerged from these heaps: 



Musca domestica 34 



Storyioxys calciirans 200 



Scatophaga stercoraria i 



No emergence took place from December 11 to April 2. From April 2 

 to June 4, a total of 347 flies were taken, as shown in Table VII. 



Table VII. — Total num,ber of flies emerged during the spring of igiy from two heaps 

 of over-wintered horse manure 



Species. 



Musca domestica 



Storyioxys calcitrans 



Myospila meditabunda 



Muscina assimilis 



Fannia canicularis 



Hydrotaea armipes 



Other species of Anthomyiidae 



Scatophaga furcata 



Scatophaga stercoraria 



Total 



Period of emergence. 



April 23. 

 May 14. 



April 20 to May 14. 

 April 30 to Jtuie i. 

 April 23 to May 21. 

 April 23 to May 25. 

 April 16 to May 14. 

 April 2 to May 14. 

 April 2 to May 21. 



From these three experiments only two specimens of house flies 

 emerged during the spring. If this number is too small to prove this to 



