158 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



Table XLVI. — Second-brood eggs. Incubation period of eggs laid in the rearing 



cages — Continued . 





Red riug. Black 



spot. Hatched. 





No. of 

 apple. 



Num- Date of 











Length 













ber of 



ffiS? 1 " Dateof 



Num- Pate of 



Num- 



Date of 



Num- 



of egg | 





eggs. 



tlon - appear- 



ber of appear- 



ber of 



appear- 



ber of 



stage. | 







, ance. 



eggs. ance. 



eggs. 



ance. 



eggs. 





















Days. 











I (Sept. 6 



2 



Sept. S 



3 



12 



60 



9 



Aug. 27 



Aug. 31 



8 i^Sept. 7 



6 



Sept. 9 



5 



13 











[Sept. 8 



1 



Sept. 10 



1 



14 



61 



2 



...do 



...do 



1 Sept. 7 



1 



Sept. 9 



1 



13 



62 



2 .. 



...do 



2 Sept. 6 



2 



Sept. 8 



2 



12 



63 



7 



Aug. 28 



Sept. 1 



•(Sept. 8 

 5 {Sept. 9 



MSept. 11 



i llsept. 11 

 1 jfSept. 12 



6 

 1 



14 

 15 



64 



7 ...do ...do 



fi I/Sept. 8 

 6 \Sept. 9 



. USept. 10 

 % Sept. 11 

 z Sept. 12 



1 

 4 

 2 



13 

 14 

 15 



65 



5 ...do ...do 



1 



ifSept. 7 



5 ^Sept. 8 



llSepc. 9 



1 

 3 



1 



[Sept. 9 

 fSept. 10 



1 



4 



12 



13 



66 



8 ...do j...do 



K /Sept. 7 

 s \Sept. 8 

 2 ...do 



5 

 3 



}..do 



8 



13 



67 



2 Aug. 29 '...do 



2 



Sept. 11 



2 



13 ! 



68 



5 ...do do 



5- /-do 



|\Sept. 9 



3 

 2 



...do 



Sept. 12 



4 



1 



13 



14 



69 



3 ...do do 



3 Sept. 8 



3 



Sept. 11 



3 



13 



70 



5 Aug. 30 



/..do 



\Sept. 2 



, IfSept. 10 

 i [{Sept. 11 

 ° [Sept. 12 



2 

 2 



1 



lsept. 13 

 [Sept. 14 



3 



2 



14 

 15 



~\ 



3 | Aug. 31 



/..do 



\Sept. 7 



1 



Sept. 10 



1 



Sept. 13 



1 



13 





1 



Sept. 12 



1 



Sept. 14 

 ...do 



1 



14 



72 



7 ...do 



Sept. 4 



1 



...do 



6 



4 



14 



73 



2 ...do 







---do 



2 



...do 



2 



14 



74 



7 Sept. 1 



/Sept. 4 

 \Sept. 7 



3 

 3 



j>Sept. 13 



7 



Sept. 15 



' 



14 



75 



22 ...do 



/Sept. 4 



{s To:.L 



5 

 10 



}..do 



21 



/..do 



\Sept. 16 



15 

 1 



14 

 15 



76 



4 



Sept. 3 



4 



Sept. 15 



4 



Sept. 17 



4 



14 



77 



16 



Sept. 4 



...do 



4 







Sept, 18 

 Sept. 25 



4 



14 



78 



4 



Sept. 12 







' Sept." 22" 



i 



4 



13 





From Table XLVI it will be seen that the average egg stage was 

 12.5 days, the later individuals remaining in the egg slightly longer 

 than the earlier, a phenomenon probably due to the gradual lower- 

 ing of the temperature. Out of 845 eggs deposited, 760, or a frac- 

 tion under 90 per cent, hatched. As can be seen from a study of 

 Table XLVI the red ring is not a constant factor in the egg develop- 

 ment, since it could be discovered in only 610 individuals. Mortality 

 is about equally great before and after the appearance of the black 

 spot. Table XLVII shows the variations in the length of the egg 

 stage as recorded in Table XLVI. 



Table XLVII. — Second-brood eggs: Variations in the length of the egg stage as recorded 



in Table XL VI. 





II 



Number 

 of eggs. 



Days. 



68 



11 



301 

 307 



12 

 13 



76 



14 



Number 

 of eggs. 



Davs 



760 



Table XL VIII is a summary of Table XLVI and shows the aver- 

 age, maximum, and minimum length of the egg stage. 



