368 NEW YORK STATE MUSEUM 



This is a slightly smaller per cent than that obser\-ed last vear, 

 but the cage in which this experiment was tried was planted with 

 a large number of quarter to half grown grubs. An examination 

 in the spring showed that the two vines in cage 5. which we used 

 for this test, were practically free from grubs and as a consequence 

 it was restocked with 140 large grubs and over 60 small ones, 

 making a total of 218. 179 beetles were obtained from these 

 grubs on or before Aug. i, indicating that some, at least, of the 

 partly grown grubs miist have attained full size ver\' rapidlv, 

 transformed and emerged within a comparatively short period. 

 It would therefore appear as though the beetles foimd in the vine- 

 yard during the latter part of the season and even into September 

 or October, are in all probability those which have enjoved a pro- 

 longed adult existence of two or more months, rather than belated 

 individuals from the small grubs so frequently met with in early 

 spring. The appearance of beetles above groimd, as previously 

 pointed out, is a matter of considerable importance whatever 

 method is adopted for the control of the insect. The period 

 elapsing between pupation and the emerging of the beetles, is a 

 comparatively uniform one and consequently cultivation for the 

 destruction of the pupae should be at a time when most of the 

 insects are in this helpless condition. It is equally important to 

 destroy the majority of the beetles either by collecting or with 

 poison, before they have deposited many eggs, and as shown by 

 our obser\-ations of last year, this can be done provided manv 

 are collected or killed within 7 to 10 days after they first appear, 

 and then the majority of the remaining beetles destroved within 

 the next week or 10 da vs. 



Our records regarding the relative abimdance of beetles are 

 also confirmed by obser^-ations in cage i. which was planted with 

 200 full grown grubs [see record of cage experiments]. This cage 

 was a check one and the insects were counted as closelv as possi- 

 ble at more or less frequent inter\-als from July 7 onward. It 

 will be obser\'ed by referring to the record, that more insects were 

 seen July 13 and 15, within a week or 10 days after they first 

 appeared, than at any other time. 



^SS^- The extended obser^-ations on the oviposition habits 

 of this species in 1903 hardly required duplication and it is per- 

 haps sufficient to state that no evidence was met with to show 

 that our conclusions in this respect were in the least erroneous. 

 It will be sufficient in this connection to point out the salient 

 features of our earlier studies. In the case of one female we found 



