16 



Texas Agricultural Experiment Station 



These cocoons were spun in cages in the laboratory with normal 

 artificial heat. The average period of construction of this brood was 

 4.73 days. 



THE PUPA 



transformation 



As the cocoon nears completion, the larva beconies very sluggish, and 

 the body shortens. The last act of the larva is to make an incision 

 in the cocoon near the head end which provides for the easy emergence 

 of the moth at maturity. The time required in the transformation 

 from the larva to the pupa varies with the broods and somewhat within 

 the broods. 



Table 10. — Transformation period, summer 1912. 



Larva. 



Aug. 13, 

 Aug. 7, 

 Aug, 10, 

 Aug. 13, 

 Aug. 14, 

 Aug. 13, 

 Aug. n, 

 Aug. 17, 

 Aug. 14, 

 Aug. 16, 

 Aug. 19, 

 Aug. 18, 

 Aug. 18, 

 Aug. 19. 

 Aug. 19, 

 Aug. 29. 

 Aug. 19. 

 Aug. 19, 

 Aug. 21 , 

 Aug. 21. 



1912 

 1912 

 1912 

 1912 

 1912 

 1912 

 1912 

 1912 

 1912 

 1912 

 1912 

 1912 

 1912 

 1912 

 1912 

 1912 

 1912 

 1912 

 1912 

 1912 



Aug. I.'). 

 Aug. 15, 

 Aug. 15, 

 Aug. 15. 

 Aug. 16. 

 Aug. 16. 

 Aug. 20. 

 Aug. 20, 

 Aug. 20, 

 Aug. 21, 

 Aug. 21 , 

 Aug. 21, 

 Aug. 22, 

 Aug. 22, 

 Aug. 22, 

 Aug. 22, 

 Aug. 23, 

 Aug. 23, 

 Aug. 23, 

 Aug. 23, 



1912 

 1912 

 1912 

 1912 

 1912 

 1912 

 1912 

 1912 

 1912 

 1912 

 1912 

 1912 

 1912 

 1912 

 1912 

 1912 

 1912 

 1912 

 1912 

 1912 



Period. 



2 days 



8 days 



5 days 

 2 days 



2 days 



3 days 



9 days 

 3 days 



6 days 

 5 days 



2 days 



3 days 



4 days 

 3 days 

 3 days 



3 days 



4 days 

 4 days 

 2 days 

 2 days 



This transformation took place in the cages in the laboratory at 

 normal temperature. The average period of transformation of thia 

 brood was 3.75 days. 



Table 11. — Transformation period, fall 1912. 



This transtormation took place in the laboratory with normal arti- 

 ficial heat. The average period was 6.40 days. 



