38 



BULLETIN 



U. S. DEPARTMENT OF AGRICULTURE. 



Table XXXI.- — Length of feeding period of the ivintering larvse of the first brood, stock' 

 jar method. Winthrop, Me.. 1914 — Continued. 



Number of individuals. 



Date of 



entering 

 fruit. 



Length of feeding period in specified days. 



35 36 



<? 9 3 9 



38 



e 9 



S 9 



e 9 . e 9 cf 9 



2 



Julv 7 

 July 8 

 July 9 

 July 11 

 Julv 12 

 July 13 

 July 14 

 July 15 

 July 16 

 Julv 17 

 Julv 18 

 July 19 

 July 20 

 Julv 21 

 July 22 

 Julv 23 



4 



2 





4 



3 



9 



14 



9 



18 



11 



19 



3 .. 



20 



6 ....:.. -" 



6 



11 



Julv 24 



33 



Julv 25 



4 



July 26 

 Julv 2S 



9 



10 



July 29 

 Julv 31 



19 



24 



Aug. 1 

 Aug. 2 

 Aug. 3 

 Aug. 4 

 Aug. 5 

 Aug. 6 

 Au? 8 



16 



40 



13 



10 





10 



2 



Aug 9 



341 3 and 2 





Sex undetermined 



Total 



(1) 



j 2 

 1 



Average length of feeding period. 341 male and female larvse, 25.717 days; 140 male larvae, 23.935 days; 

 176 female larvae. 27.022 davs. 



Maximum length of feeding period, 341 male and female larvae, 46 days: 140 male larvae, 46 days; 

 176 female larvae, 46 days. 



Minimum length of feeding period, 341 male and female larvae, 19 days; 140 male larvae, 19 days; 

 176 female larvae", 19 days. 



Length of the feeding period of wintering first-brood larvse (bagged- 

 fruit method). — Table XXXII records the feeding period of 492 win- 

 tering first-brood larvae. The average feeding period of these larvae 

 was 31.865 days; maximum, 55 days; minimum, 24 days. The 

 average feeding period for 226 male larva? was 30.960 days; maxi- 

 mum, 55 days; minimum, 24 days. The average feeding period for 

 213 female larvae was 32.436 days; maximum, 55 days; minimum, 

 25 davs. 



