BULLETIN 59, U. S. DEPARTMENT OF AGEICULTUEE. 

 Table II. ^ — Length of larval stage of tobacco splitivorm. 



Kg? hatched 



, Ijarva pu- 

 pated night 

 of— 



Larval 



Average 

 mean 



Food 



night of— . 



stage. 



tempera- 



plant. 







ture. 









Days. 



o J. 





June 21,1910 



Julv 6, 1910 



15 



78.7 



Tobacco. 



July 9,1913 



Julv 25,1913 



16 



81.1 



Do. 



Aus. 25,1913 



Sept. 10,1913 



16 



81.2 



Do. 



Aug. 25,1913 



Sept. 11,19)3 



17 



81.1 



Do. 



f^ept. 27,1911 



Nov. 3, 1913 



37 



64.4 



Do. 



The lengths of the larval stage given above 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 spUtworm. 



Number 

 of indi- 

 viduals. 



Larva pupated 

 night of — 



Moth emerged 

 night of — 



Pupal 



stage. 



Average 

 mean 



tempera- 

 ture. 



Food plant of 

 larva. 



2 

 1 1 



Apr. 21,1909 

 May 22,1910 

 July 6, 1910 

 July 23,1913 

 Aug. 19,1913 

 do 



May 14,1909 

 June 5, 1910 

 July 14,1910 

 Aug. 1,1913 

 Aug. 28,1913 

 do 



Days. 

 23 

 14 



8 



7 



9 



9 

 10 



8.5 

 12 



6 



5.5 



6- 



6 



7 



7 



6 



7 



7 

 13 

 14 

 16 

 16 

 12 

 15 

 14 



°F. 



65.1 



67- 



83.3 



85.1 



77.1 



77.1 



77.5 



76.4 



76.8 



83.7 



S3. 7 



83.7 



83.7 



83.2 



81.8 



81.4 



81.4 



81 



69 



69.1 



68- 



67.6 



70.4 



68.3 



68.3 



Tobacco. 

 Do. 

 Do. 



Potato. 



"Jimsonweed." 

 Potato. 

 Tobacco. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 



Do. 

 Potato. 



Do. 

 Tobacco. 



Do. 



Do. 

 PhysaUs. 



Do. 



do 



Aug. 21,1913 

 Aug. 27,1911 

 Aug. 31,1913 



do 



Aug. 29,1913 

 Aug. 30,1913 3 

 Sept. 8, 1911 

 Sept. 6,1913 

 <do3 



do 



: do* 



Sept. 1,1913 



do 



Sept. 2,1913 

 Sept. 3,1913 



do2 



do 



Sept. 10, 1913 



do 



Sept. 11,1913 

 Sept. 13,1913 

 Sept. 27,1913 

 Sept. 30, 1913 

 Oct. 1,1913 



Sept. 7,1913 

 Sept. S,1913 

 Sept. 9,1913 



do 



do 



Sept. 10, 1913 

 Sept. 23, 1913 

 Sept. 24, 1913 

 Sept. 27, 1913 

 Sept. 29, 1913 

 Oct. 9, 1913 

 Oct. 15, 1913 < 



do< 



1 Reared from moths of the habitual potato-feeding type. ' Forenoon. '2 p.m. < 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 

 adi'lt stages. No larvae, so far as known, have entered hibernation 

 successfully. 



