28 



in the class which it resembled most closely. The following table 

 gives the results of this examination of the development of the 

 weevils at the time they were fumigated. 



Stages in the development of the pea weevils 

 at the time of fumigsktion. 



Larva 



(I grown) 



Larva 

 (I grown) 



Pupa 



Adult 

 escape d 



Average percentage of weevils at each stage 

 of developnr ent when fumigation took place. 



1897 



47 



1898 



14 



27 



59 



1900 



1901 



10 



82 



50 



20 



25 



53 



Average 

 4 years. 



11 



16 



60 



13 



These results are very suggestive. They throw much light upon 

 the probable effectiveness of the fumigation process in the eradica- 

 tion of the pea weevil. It is owing to the irregularity in the 

 development of the weevil that some of the insects escape so 

 early in the season, while others remain in the peas until a much 

 later date. 



In some seasons, the weevils develop and escape much earlier than 

 in others. It is quite probable that the conditions of the weather, such 

 as temperature and moisture, exert an influence on their development. 

 In 1902, the weevils did not escape until much later in the season 

 than usual, evidently owing to the wet, cold summer. 



