350 



THE GYPSY MOTH. 



at 8 A.M. At station 2, one-fourth of a mile to leeward of 

 station 1, six marked males were liberated at 8.30 a.m., and 

 at 2 P.M. seven more males were liberated at this st-ation. 

 At station 3, one-half mile to leeward of station 1, six 

 marked males were liberated at 8.45 a.m., and at 2.15 p.m. 

 eight others similarly marked were also allowed to escape 

 at this station. There were no results from this experiment. 



Experiment JVb. 8. 



Fair. Wind, from nearly all directions ; average move- 

 ment, 5 miles. Two traps, containing six female moths 

 each, were set up at 8.30 a.m. At station No. 2, one-fouilh 

 of a mile to leeward of station 1, eight marked males were 

 liberated at 9.50 a.3I. At station 3, one-half mile to lee- 

 ward of station 1, six marked males were liberated at 9.08 

 A.M., and six other males similarly marked were liberated at 

 a distance of sixteen 3'ards to the right of station 1. One 

 male moth from station 2 returned at 10.30 a.m. The wind 

 shifted to east and south-west, and at 1.30 a heavy rain pre- 

 vented all further work. 



The data concerning the direction and wind movement, 

 given in these experiments, were kindly furnished by Mr. J. 

 W. Smith, the Boston local forecast official, and, as the place 

 where the experiments were performed was within four miles 

 of the Boston observatory, the figures in all probability are 

 approximately accurate for the locality. 



Remarks on the Above Experiments, 

 These experiments show that, under favorable conditions, 

 female gypsy moths will assemble males from various dis- 

 tances up to half a mile, and it is possible that they might 

 have been attracted from somewhat greater distances had 

 males been liberated in larger numbers from stations more 

 remote from the female. It must be borne in mind that 

 these experiments were conducted under what would seem 

 to be the most favorable conditions, namely, upon a level 

 area, where a sweep of the wind could be obtained ; yet it 

 may be possible that what was gained by the favorable con- 

 ditions was in a measure olfset by a slight weakening of the 

 males caused by the handling necessary while marking them. 



