New Yorx AGRICULTURAL EXPERIMENT STATION. 277 
the beetles must be attacked at the proper season in order to be 
successful in combating them. 
On the supposition that two fields, which were equally well 
eared for and from which pickles were picked approximately the 
same number of days, would produce approximately the same num- 
ber of pickles, some idea of the damage this pest can do to a crop 
ean be obtained by comparing the yield at Smithtown Branch, 
90,536 per acre, where, comparatively speaking no beetles oc- 
eurred, with the yield at Hicksville, 71,727 per acre, where it 
was a struggle to save the vines. The difference in yield per acre 
in the two places was 18,809. At least one-half of this difference 
should be credited to the work of the beetles. If no effort had been 
made to prevent their work at the latter place, the late planted 
acre would have been a total failure. 
SEXUAL DEVELOPMENT OF THE CUCUMBER 
BEETLE. 
The data given in the following tables are taken from micro- 
scopic dissections of material collected during 1898. 
