352 THE GYPSY MOTH. 



attracted a male, but did not succeed in mating. At 12 M., 

 a female attracted a male, with the same result as in the pre- 

 ceding case. 



Experiment No. 12. 



July 30. At 9.30 A.M., the head and thorax of four 

 females were completely coated with shellac varnish, after 

 which operation the moths became quite stupid and one of 

 them seemed apparently dead. At 4.30 P.M., one of the 

 females mated with a male, but none of the others mated. 



Experiment No. 13. 



July 30. At 10.15 A.M., four unfertilized females were 

 coated with varnish along the sides of the thorax and abdo- 

 men. They were then placed in a wire-gauze can, which 

 was attached to a tree, in the Woburn colony, at a height of 

 about six feet from the ground. This trap was visited by 

 thirty-eight males from 10.15 A.M. to 3 P.M. 



Experiment No. 14. 



July 30. Another can, containing four unfertilized females 

 in normal condition, and used as a check, was visited by 

 thirty-eight males from 10.15 A.M. to 3 P.M. 



Experiment No. 15. 



July 30 . Another can , containing four unfertilized females , 

 whose wings were covered on both surfaces with shellac, was 

 exposed under similar conditions. This trap was visited by 

 seventy-six males from 10.15 A.M. to 3 P.M. 



Experiment No. 16. 



July 30. A can containing four unfertilized females, with 

 the whole of the body, except the wings, covered with shel- 

 lac, was exposed under the same conditions. This trap was 

 visited by only one male. A check can containing four un- 

 fertilized females, in normal condition, exposed in the same 

 manner and at the same place as those in the preceding 

 experiments, to determine what would be the normal rate of 

 assembling, was visited by seventy-seven males from 10.15 

 A.M. to 4 P.M. 



