18 



BULLETIN 901, U. S. DEPARTMENT OF AGRICULTURE. 



TIME AND DURATION OP PERIOD IN GROUND. 



The duration of the period in the ground of 115 individuals reared 

 varied from 12 to 17 days with an average of 14.50 days. This 

 period is covered by records extending from July 14 to August 11. 

 The data on time and duration of this period are given in full in 

 Table XXIII. 



Table XXI. — Second larval 

 stage of A . woodsi, North East, 

 Pa., 1918. 



Table XXII. — Feeding period 



of third larval stage of A. 



■ woodsi, North East, Pa., 1918. 



Number 



Duration 



of larvae. 



of stage. 





Days. 



6 



4 



41 



5 



113 



6 



45 



7 



3 



8 



1 



9 



1209 



2 6.00 



Number 



Duration 



of larvae. 



of stage. 





Days. 



4 



4 



72 



5 



69 



6 



12 



7 



18 



8 



14 



9 



1189 



= 6.62 



1 Total. 2 Weighted average. ' Total. 2 Weighted average. 



DURATION OP PREPUPAL STAGE. 



The prepupal period of 57 larva? recorded varied from 4 to 7 days, 

 with an average of 4.68 days, as shown by Table XXIV. The total 

 period covered by records on the prepupa extended from July 14 to 

 August 1. 



Table XXIII. — Time and duration of period in ground of A. woodsi, North East, Pa., 



1917. 



Date of 

 entering 

 ground. 



Date of 

 emergence. 



Number 

 of indi- 

 viduals. 



Duration 

 of period. 



Date of 

 entering 

 ground. 



Date of 

 emergence. 



Number 

 of indi- 

 viduals. 



Duration 

 of period. 



July 14 

 14 

 15 

 15 

 16 

 17 

 17 

 17 

 20 

 20 

 20 

 21 

 21 

 21 

 21 

 22 

 22 



July 29 



30 



30 



31 



30 



31 



30 



Aug. 1 



2 



3 



4 



2 



3 



4 



5 



4 



5 



1 

 4 

 4 

 2 

 1 

 2 

 7 

 2 

 2 

 1 

 1 

 1 

 4 

 8 

 5 

 4 

 13 



Days. 

 15 

 16 

 15 

 16 

 14 

 13 

 14 

 15 

 13 

 14 

 15 

 12 

 13 

 14 

 15 

 13 

 14 



July 22 

 22 

 22 

 23 

 23 

 23 

 24 

 24 

 25 

 25 

 25 

 25 

 25 

 26 

 26 



Aug. 6 

 7 

 8 

 4 

 6 

 7 

 7 

 8 

 6 

 8 

 9 



10 

 11 

 9 

 11 



11 

 3 

 2 

 1 

 6 



10 

 3 

 5 

 1 

 1 

 6 

 1 

 1 

 1 

 1 



Days. 

 15 

 16 

 17 

 12 

 14 

 15 

 14 

 15 

 12 

 14 

 15 

 16 

 17 

 14 

 16 



1115 



2 14. 50 



1 Total. 2 Weighted average. 



DURATION OF PUPAL STAGE. 



The pupal period of 45 individuals recorded varied from 6 to 9 days, 

 with an average of 7.24 days, as shown by Table XXV. The total 

 period covered by records on the pupa extended from July 20 to 

 August 7. 



