20 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



The moths of experiment No. 2 were found mating at 10.30 a. m., 

 August 6, or two days previous to the first egg deposition. On an 

 average the first eggs were laid five days after the emergence of the 

 moths and for an average period of five days ; the maximum number 

 of eggs per female was 91; the average number of eggs per female, 

 35.8. These figures are lower than those from similar but later 

 experiments in 1911. 



Table XVIII. — Egg deposition by individual moths of the summer brood; summary oj 



Table XVII. 



Observations. 



Number of individual months. 



Total eggs per female 



Days before egg deposition 



Days duration of egg deposition 

 Days alive after egg deposition. 

 Da vs moths lived 



Table XIX. — Egg deposition by individual moths of the summer brood; summary of 



Table XVII. 



Observations. 



Eggs per female 



Eggs per day per female 



Days before egg deposition per female 



Days of egg deposition per female 



Days moths lived after egg deposition 

 Days moths lived 



Average. 



Maximum. 



35.8 



91 



7.16 



36 



5 



8 



5 



9 



3.18 



7 



12.1 



17 



Minim urn. 



The moths were confined in common jelly glasses with perforated 

 tin covers. A fresh pear leaf was inserted for egg deposition, and 

 food was given in the form of dilute sugar and honey solution placed 

 on a small piece of sponge. Most of the eggs were laid on the leaves, 

 though a few were invariably also found on the glass. 



Judging from the records of emergence of moths and their habits as 

 observed above, it becomes evident that the earliest eggs from this 

 brood were laid about August 3. The height of the egg deposition 

 period should have been September 1, and the close of the period 

 September 15. 



Length of life of moths. — A record on the length of the life of the 

 summer moths in the so-called stock jars was taken on 445 individuals 

 (Tables XX and XXI). These moths were kept under similar con- 

 ditions to those of the spring brood. 



