BULLETIN 59, U. S. DEPARTMENT OF AGRICULTURE. 

 Table II. — Length of larval stage of tobacco spliticorm. 



•3JSS? ^ ^ 



June 21,1910 

 July 9, 1913 

 Aug. 25.1913 

 Aug. 25,1913 

 Sept. 27,1911 



Julv 6, 1910 

 Julv 25.1913 

 Sept. 10, 1913 

 Sept. 11,1913 

 Nov. 3,1913 





Average 



Larval 



mean 



stage. 



tempera- 





ture. 



Days. 



e F. 



15 



78.7 



16 



81.1 



16 



81.2 



17 



81.1 



37 



64.4 



Food 

 plant. 



Tobacco. 

 Do. 

 Do. 

 Do. 

 Do. 



The lengths of the larval stage given aboye are corroborated by 

 about 25 records giving the combined length of the larval and pupal 



stages. 



Table III. — Length of pupal stage of the tobacco spliticorm. 



Number 

 of indi- 

 viduals. 



Larva pupated 



Moth emerged 



Pupal 



Average 

 mean 



Food plant of 



night of — 



night of — 



stage. 



tempera- 

 ture. 



larva. 







Days. 



°F. 





2 Apr. 21.1909 



Mav 14,1909 



23 



65.1 



Tobacco. 



4 , Mav 22.1910 June 5,1910 



14 



67- 



Do. 



1 July 6.1910 July 14,1910 



8 



83.3 



Do. 



1 July 25.1913 i Aug. 1.1913 



7 



85.1 





1 3 



Aug. 19.1913 | Aug. 28.1913 



9 



77.1 



Potato. 





do do 



9 



77.1 



"Jimsonweed." 





do i Aug. 29,1913 



10 



77.5 



Potato. 



i l 



Aug. 21,1913 Aug. 30.1913 3 



8.5 



76.4 



Tobacco. 





Aug. 27,1911 : Sept. 8.1911 



12 



76.8 



Do. 





Aug. 31.1913 : Sept. 6,1913 



6 



83.7 



Do. 





do dos 



0.0 



83.7 



Do. 





do do 4 



6- 



83.7 



Do. 





Sept. 1.1913 Sept. 7,1913 



6 



83.7 



Do. 





do Sept. 8,1913 



7 



83.2 



Do. 





.Sept. 2,1913 Sept. 9.1913 



7 



81.8 



Do. 





Sept. 3.1913 1 do 



6 



81.4 



Do. 





do 2 do 



7 



81.4 



Do. 





do Sept. 10,1913 



7 



81 



Do. 





Sept. 10,1913 Sept. 23.1913 



13 



69 



Potato. 





do Sept. 24.1913 



14 



69.1 



Do. 





Sept. 11.1913 Sept. 27.1913 



16 



68- 



Tobacco. 





Sept. 13. 1913 Sept. 29, 1913 



16 



67.6 



Do. 





Sept. 27. 1913 Oct. 9,1913 



12 



70.4 



Do. 





Sept. 30.1913 Oct. 15.1913* 



15 



68.3 



Phvsalis. 





Oct. 1,1913 do< 



14 



68.3 



Do. 



1 Reared from moths of the habitual potato-feeding type. 2 Forenoon. s 2 p. m. 4 Afternoon. 

 SEASONAL HISTORY. 



Full-grown larvae have been received from Florida in late April, indi- 

 cating that oviposition may begin in that region as early as March. 

 Larvae have not been found at Clarksville, Tenn., earlier than June 3, 

 and moths have emerged in numbers as late as the middle of No- 

 vember. It seems probable that at least six generations are produced 

 in Florida and that about three or four are produced at Clarksville, 

 Tenn. Moths emerged in five cages at Clarksville November 14, 

 1913, and were still active December 15, 1913, upon which date 

 about an equal number of cages still contained pupae. These records 

 seem to indicate that the winter is passed in both the pupal and 

 adult stages. No larvae, so far as known, have entered hibernation 

 successfully. 



