85 



nating generation in the cotton belt, and this period for northern 

 localities is still greater. 



Data collected at the laboratory for over a hundred individuals at 

 different times during the season are summarized in the following table: 



Table XXXII. — Duration of 2)upal stage. 



Larva in 

 soil. 



May 8-10 . 

 May 13-16 

 May 19 . . . 

 May 21-22 

 May 26 . . . 

 May 30-31 

 Juiie 3-4 . 

 June 10 . . , 

 June 15 . . 



Moth 

 emerged. 



Aver- 

 age 

 time. 



Pupal 

 stage. 



Effect- 

 ive 

 temper- 

 ature. 



May 31 



June 2-6... 

 June 7-9 .. . 

 June 6-10.. 

 June 11-15 . 

 June 17-20. 

 June 20.... 



June 24 



June 24- 

 Julv 3. 



Days. : Days. 



22 ! 



20i ' 



20 



18 



I7i 14 



19 ' 14i 

 16i 16 



14 13 



15 ! 13 



o jp 



662' 



770 



653 



598. ( 



615 



665 



605 



530 



588 



Larva in Moth 



soil. emerged. 



June 18-21. July 4-7. . . 



July 18 ....| Aug.2 



July 27-29 . Aug. 12-15 



Aug. 5 Aug. 20 ... 



Aug. 8 Aug. 25 



Aug. 17-19. Sept. 1-3 .. 



Sept. 7 Sept. 20 . . . 



Sept. 20 Oct. 16 



Sept. 29 ... . Oct. 23 ... . 



Aver- 

 age 

 time. 



Days. 

 15 

 14i 

 16 

 15 

 16i 

 15 

 17 

 26 

 25 



Effect- 

 Pupal I ive 

 stage, itemper- 

 I ature. 



Days. 



° F. 





621 





607 





631 





606 





708 





639 



16 



621 





885 



20 



724 



It will be noticed that the records in the third column include the 

 time between the entrance of the larva into the soil and the emergence 

 of the moth, while the time for the true pupal stage, shown in the 

 fourth column, is somewhat less. The exact time is usually hard to 



45 

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DAYS. 



MAY 



JUNE. 



OULY 



AU6. 



SEPT. 



OCT. 



DAYS 



Fig. 10.— Chart showing relative length of pupal stage during season of 1904, Paris, Tex. (original). 



determine, however, without disturbing the pupa concealed in its cell. 

 Under normal conditions the quiescent stage, after the burrow is 

 completed, lasts from a few hours to five days. 



The comparative length throughout the season at Paris, Tex., of 

 the stage passed in the ground is shown in figure 10. 



During 1903 a series of pupae observed at Calvert, Tex., passed 

 through this stage in ten and a half days, a shorter period than any 

 observed at Paris, due no doubt to the more southern locality. 



