TRAPPING MALES. 359 



collect the female pupas and allow them to emerge in con- 

 finement, because in this way the matter could be controlled 

 more successfully than in any other. It was also found that 

 the traps attracted best when placed but a few feet above the 

 ground. 



Fifteen traps were used during these experiments. No. 7 

 was removed after six days, to be placed elsewhere, as noth- 

 ing was captured on it up to that time. No. 14 had sticky 

 fly-paper on it the first five days, during which time it 

 caught two hundred males. The fly-paper was then removed, 

 and a pan containing the water and kerosene was suspended 

 an inch or two below the trap. During the next twelve days 

 sixty-five males were captured in the pan. The traps were 

 put out from July 31 to August 10, and were taken in from 

 August 19 to August 30. The records of the traps are 

 given below : 



No. 1 was put out July 31, and taken in August 19, having 

 captured 82 males. 



No. 2 was put out July 31, and taken in August 19, having 

 captured 34 males. 



No. 3 was put out August 1, and taken in August 28, having 

 captured 175 males. 



No. 4 was put out August 1, and taken in August 28, having 

 captured 87 males. 



No. 5 was put out August 2, and taken in August 30, having 

 captured 36 males. 



No. 6 was put out August 2, and taken in August 25, having 

 captured 88 males. 



No. 7 was put out August 2, and taken in August 8, having 

 captured nothing. 



No. 8 was put out August 8, and taken in August 30, having 

 captured 167 males. 



No. 9 was put out August 8, and taken in August 26, having 

 captured 37 males. 



No. 10 was put out August 8, and taken in August 30, having 

 captured 85 males. 



No. 11 was put out August 8, and taken in August 26, having 

 captured 213 males. 



No. 12 was put out August 8, and taken in August 28, having 

 captured 131 males. 



