341 



If we take the total numbers of eggmasses of every 7 days in 

 the whole period from Jan. I8th till March 21st, we get the following 

 numbers. wherein the days Febr. 15 and 16 are respectively esti- 

 mated on 128 and 122 eggmasses and the dav of March 14 on 25, 

 March 21 on 33. 



These numbers are brought in curve in fig. 2, which clearly 

 shows the rise and i'all of the number of eggmasses in a period 

 of some 2 months, just as is shown in the recent publication of Mr. 

 P. van der Goot in this periodical. 



18—21 25 31 I- ; 8 I 'i 15—21 22—28 1-7 s- 1 ï 15—21 

 January February March 



Fin'. 2. 



Collected eggmasses of Diatraea striatalis in periods of 7 days from 

 18 January till March 1915. 



