366 NEW YORK STATE MUSEUM 



by the 8th most had transformed to this stage. It will be seen 

 by the above that there is a range of 10 days or two weeks between 

 the transformations of these insects from year to year, and as 

 previously established, an almost equal difference in time between 

 the change on light and on heavy soil; consequently it is neces- 

 sary for vineyardists who plan to destroy large numbers of the 

 pests by cultivation, to watch closely the development of the 

 insects not only in the vineyard as a whole but in some cases 

 in various portions of it on account of the marked influence on 

 their development exerted by various soils. 



Beetles. Our observations of 1903 were largely confirmed by 

 those of 1904. The first beetles observed abroad in 1902, which 

 was a remarkably late season, were met with July 2, while in 1903 

 a few were taken June 19. The past season was later than the 

 preceding one and none were observed prior to June 29 and in 

 most vineyards comparatively few were met with till early in 

 July. Our cage experiments in 1903 showed that over 92% of 

 the beetles appeared within two weeks after the first were taken 

 and practically none after July 21; in other words, out of 506 

 bred from under two vines, 477 emerged by July 21. This record 

 is closely paralleled by that obtained in 1904, when 155 beetles, 

 87% of the entire number, were taken within the first two weeks 

 after the insects began to appear in the cage. 



