140 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



Table XXIV. — Second-brood eggs. Incubation period of eggs laid in rearing cages- 

 Continued. 









Red ring. 



Black spot. 



Hatched. 





Num- 



Num- 



Date of 















Length 















ber of 



ber of 



deposi- 



Date of 



Num- 



Date of 



Num- 





Num- 



of egg 



apple. 



eggs. 



tion. 



appear- 



ber of 



appear- 



ber of 



Date. 



ber of 



stage. 









ance. 



eggs. 



ance. 



eggs. 





eggs. 























Days. 

 15 

 17 



174 



8 



Sept, 10 



Sept. 13 



8 



/Sept. 22 

 \Sept. 23 



3 

 2 



Sept. 25 

 Sept. 27 



2 

 3 



175 



3 



...do 



...do 



3 



/Sept. 22 

 \Sept. 23 



2 

 1 



Sept. 25 

 Sept. 26 



2 



1 



15 



16 



176 



13 



...do 



...do 



13 



/Sept. 22 

 \Sept. 23 



"Septl^i" 



11 

 2 



Sept. 25 

 Sept. 26 



10 

 3 



15 

 16 



178 



12 



Sept. 11 



/Sept. 15 

 \Sept. 17 



6 



3 



3 

 9 



Sept. 25 

 Sept. 26 



1 

 11 



14 

 15 



179 



1 



Sept. 12 



Sept. 15 



1 



Sept. 26 



1 



Sept. 27 



1 



15 



180 







Sept. 14 



Sept. 18 



2 



...do 







Sept. 29 



5 



15 



181 



6 



...do 



...do 



6 



/..do 



\Sept. 27 

 Sept. 26 



5 

 1 



}..do 



...do 



6 



15 



182 



13 



...do 



...do 



7 



13 



13 



15 



183 



1 



Sept. 15 



Sept. 19 



1 



Sept. 27 



1 



Sept. 30 



1 



15 



184 



6 



Sept. 17 



Sept. 20 



6 



Sept. 30 



6 



Oct. 2 



6 



15 



185 



3 



...do 







7 



...do 



7 



15 



186 



3 



Sept. 18 



Sept. 22 



2 



Oct. 1 



3 



Oct. 3 



3 



15 



187 



3 



3 



...do..... 



2 



...do 



2 



15 



188 



3 



Sept. 21 



Sept. 24 



3 



Oct. 4 



2 



Oct. 6 



2 



15 



189 



3 



Sept. 22 



Sept. 25* 



3 



Oct. 6 



3 



Oct. 8 



3 



16 



The length of the egg stage ranged from 7 to 17 days, with an 

 average of 10.92 days. Very little difference in the length of the 

 stage is shown by Table XXIV for the 78 days or period of oviposit- 

 ing by the first-brood moths. The red ring appeared from 2 to 3 days 

 after deposition usually, the black spot from 6 to 10 days. 



Table XXV. — Incubation period of second-brood eggs. Summary of Table XXIV. 



i For appear- 

 Observation. 1 ance of 

 1 red ring. 



For appear- 

 ance of 

 black spot. 



For incu- 

 bation. 





Days. 

 2.64 

 9 

 1 



Days. 

 9.24 

 15 

 5 



Days. 

 10.92 

 17 

 7 



Maximum 



Minimum 



SECOND BROOD OF LARV.E. 



Feeding period. — As mentioned under the egg stage, eggs were 

 obtained from July 9 to September 25, a period of 78 days, and were 

 hatching from about July 19 to October 8. The feeding periods 

 were observed on a number of these at various intervals and devel- 

 oped normally and spun cocoons in the rearing cages in which they 

 passed the winter. The details of these records are given in Table 

 XXVI. 



