10 



BULLETIN 1225, U. S. DEPARTMENT OF AGRICULTURE. 



Table 1. — Incubation period oj camphor thrips eggs. 

 IN SUMMER. 



Record 

 No. 



Date eggs 



were 

 deposited. 



Number 



of eggs 



deposited. 



Number of eggs developing in specified number 

 of days. 



Number 

 of eggs 

 failing 



to hatch. 



5 days. 



6 days 



7 days. 



8 days. 



9 days. 



1 



1921. 

 Aug. 4 

 Aug. 5 

 ...do 



3 



10 

 11 



3 



6 

 17 



8 

 21 



3 

 20 



2 

 17 

 23 



6 

 13 

 18 

 20 

 16 

 10 

 32 

 26 

 31 

 18 

 28 

 20 





2 

 6 

 9 

 3 



3 



8 



7 



10 



3 



10 



1 



11 



18 



3 



10 



13 



10 



9 



4 



15 



18 



22 



9 



11 



10 



1 

 2 

 1 











2 . 







1 



1 



3... 







1 



4... 



Aug. 6 

 .do 











5 



2 



3 

 1 



2 









1 



6 



Aug. 7 

 ...do 



6 









7 









8 



Aug. 8 

 ...do 



6 



3 







9 . 







10 



Aug. 9 

 ...do 



1 



9 

 1 

 2 

 3 

 1 









11 . 









12 



Aug. 10 

 ...do 



4 

 2 

 2 

 3 

 3 

 5 

 5 

 6 

 15 

 1 

 7 

 4 

 9 

 3 





1 



13 





I 



14 



Aug. 11 

 . .do 





1 



15 .. 







16 



Aug. 12 

 Aug. 13 

 Aug. 14 

 Aug. 15 

 Aug. 16 

 Aug. 17 

 Aug. 18 

 Aug. 19 

 Aug. 20 

 Aug. 21 



2 

 5 

 2 







17 







18 







19 







20 



2 

 7 

 2 

 5 

 7 

 3 







21 . 







22 .. 







23 . 







24 „ 



1 





25. . . 





4 







Total 





382 



78 



225 



67 



4 



1 7 











IN WINTER. 



Record 

 No. 



Date eggs 

 were de- 

 posited. 



Number 

 of eggs 



de- 

 posited. 



Number of eggs developing in s 



pecified number of days. 



Number 

 of eggs 

 failing 



to hatch. 



10 

 days. 



11 



days. 



12 



days. 



13 



days. 



14 

 days. 



15 

 days. 



16 

 days. 



1 



1920. 

 Nov. 15 

 Nov. 12 

 Nov. 17 

 Nov. 19 

 Nov. 20 

 Nov. 23 

 ...do.... 



9 

 4 

 2 

 3 

 2 

 8 

 4 

 6 

 4 

 3 

 3 

 3 

 2 

 2 

 4 

 2 

 2 

 4 

 4 

 4 

 3 

 3 

 2 



2 

 4 

 4 

 2 

 2 

 1 

 1 

 1 

 3 

 4 

 2 

 4 









1 

 1 



1 



1 

 1 



1 

 4 

 1 

 3 

 2 

 1 



2 

 1 

 1 



2 



2 



3 



2 







1 



1 



3 











4 















5. 











1 



6 











2 





2 



7....... 











3 



8 



Nov. 29 

 Dec. i 

 Dec. 3 

 Dec. 3 

 Dec. 9 

 Dec. 11 

 Dec. 18 

 Dec. 20 

 Dec. 21 

 Dec. 22 

 . .do.... 







2 



1 

 1 



1 

 1 

 1 



2 

 2 



1 







9 











10 













11 













12., 











1 

 1 







13 











1 



14 











1 



1 





1 



15 









1 

 1 



2 

 1 

 2 

 1 

 1 



1 

 1 



1 



16 













17 













o 



18 









2 

 2 

 3 



1 









19 



Dec. 23 

 Dec. 24 

 Dec. 28 

 Dec. 29 

 Dec. 31 



1921. 

 Jan. 1 

 Jan. 3 

 Jan. 4 

 Jan. 5 

 Jan. 6 

 Jan. 7 

 Jan. 8 

 ...do.... 













20 

















21 







2 

 1 

 1 



1 



1 











22 



1 



2 













23 















24 



1 













25 



1 



2 



2 













26 











2 



27 









2 



2 

 1 











28 















29 











1 







30 











1 

 1 

 1 

 3 

 1 









31 

















32 



Jan. 9 

 Jan. 10 

 ...do.... 











2 

 1 







33 















34 











1 



35 



Jan. 26 







4 



























Total 





113 



4 



4 



13 



14 



34 



25 



3 



16 









