74 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



The variations in the length of the pupal periods, as shown in 

 Table II, extended from 15 to 30 days. 



Table II. — Spring brood of pupse. Variations in the length of the pupal periods as 



recorded in Table I. 



Pupae. 



Days. 



Pupae. 



Days. 



3 



15 



10 



22 



2 



16 



7 



23 



1 



17 



12 



24 



3 



18 



2 



25 



1 



19 



1 



31 



6 



21 



1 



34 



The length of the stages were especially prolonged during the early 

 part of the period of pupation and shortest toward the close of the 

 period, due to a difference in the temperature. In Table III is 

 given a summary of the observations recorded in Table I, showing 

 an average pupal period of 22 days for the total number of observa- 

 tions. 



Table III. — Spring brood of pupae. Summary of pupal periods of Table I. 



Observations. 



Days. 



Average 



Maximum , . 



21. 9S 



34 



15 



Minimum 



SPRING BROOD OF MOTHS. 



Time of emergence of moths in the spring. — In figure 19 is shown 

 graphically the time of emergence and the relative occurrence of 

 moths of the spring brood. The records for these observations are 

 given in Table IV. 



Table IV. — Emergence of spring moths, 1909, from wintering material collected on 



banded trees during 1908. 



-p. ot „ : Number 



Date - ! of moths. 



1 



Date. 



Number 

 of moths. 



Date. 



Number 



cf moths. 



D t Number 

 ■ uate - of moths. 



June 12 

 June 13 

 June 14 

 June 15 

 June 16 

 June 17 

 June 18 

 June 19 

 June 20 



1 



June 21 

 June 22 

 June 23 

 June 24 

 June 25 

 June 26 

 June 27 

 June 28 

 June 29 



31 

 23 

 50 

 40 

 50 

 33 

 32 

 35 

 30 



June 30 

 Julv 1 

 JulV 2 

 July 3 

 July 4 

 July 5 

 July 6 

 July 7 

 JulV 8 



13 

 25 

 15 

 3 



10 



1 



4 



July 9 4 1 

 Julv 10 2 i 



: JulV 11 1 

 JulV 14 2 1 



i July 17 1 



5 

 3 

 6 

 13 



1 



10 

 24 



4S6 



Indoors, moths were observed previous to June 12, but since these 

 undoubtedly had wintered in the house their appearance does not 

 represent normal conditions, as is believed to be the case with mate- 



