68 THE MEXICAN COTTON -BOLL WEEVIL. 



Table XXV. — Duration of the pupal stage of the boll 



Place. 



Year. 



Pupated. 



Emerged. 



Num- 

 ber of 

 pupae 



Total 

 number 

 of pupa 



days. 



Aver- 

 age 

 pupal 

 period. 



Mean 

 temper- 

 ature. 



Victoria, Tex 



Do 



Do 



Do 



Do 



Do 



Do 



Do 



Victoria, Tex., ice box. 



Dallas, Tex 



Alexandria, La 



Do 



Dallas, Tex 



Tallulah, La 



1902... 

 ..do... 

 ..do... 

 ..do.. 

 ...do... 

 ...do... 

 ...do... 

 ...do... 

 ...do.. 

 1907... 

 ...do.. 

 ...do... 

 1908. . . 

 1910... 



July 6-13.. 

 July L2-18. 



July 18-23. 

 July 24-25. 

 Sept. 15... 

 Oct. 21-24. 

 Nov. 2-6.. 

 Dec. 2-13.. 



Julv 10-16. 

 July 16-22. 

 Julv 23-28. 

 Julv 29-30. 

 Sept. 20... 

 Oct. 27-28. 

 Nov. 9-13. 

 Dec. 15-29. 



June 13 



Aug. 5 



Sept. 10-13. 

 Aug. 1-6... 

 July 7-17. . . 



June 19 



Aug. 7-8... 

 Sept. 16-18. 

 Aug. 5-11.. 

 July 14-21.. 



27 



22 



... 



'- 



4 



5 



29 



4 



1 

 20 



141 

 10 

 50 



97 



84 

 392 

 111 



.'it 



24 

 212 



56 



660 



5 



43 

 717 



41 

 167. 5 



Total. 



1902- 

 1910. 



June 13-Dec. 13 



June 19-Dec. 29. 



510 



2,629.5 



3.5 

 3.8 



4.5 



4.8 



5 



!.s 



7.3 

 14 



7.:. 



5 



2.1 



5 



4.1 

 »3.3 



Degree* 



- < Ho 



69. 2 



61.55 



80.1 

 85.7 

 72.1 

 84.5 

 79.1 



5.1 



74.3 



1 The extremes were 2.8 and 3.9 days. 



PERCENTAGE OF WEEVILS DEVELOPED FROM INFESTED 



SQUARES. 1 



During the season of 1902 part of the many squares gathered in 

 infested fields for the rearing of weevils were followed to learn some- 

 thing of the percentage which produced normal adults. Xo exam- 

 ination was made for those not yielding a weevil. The decay of the 

 square during the period from its falling to the maximum time that 

 must be allowed for weevils to escape normally so obliterates any 

 small amount of work by a larva that it is difficult, even with exam- 

 ination, to determine accurately the number of dead small larvae. 



Table XXVI. — Percentage of boll weevils from infested squares. 



Localitv. 



Approximate date. 



Number 



of 

 squares. 



Number 



of 

 weevils. 



Percentage 



of squares 



producing 



weevils. 



Victoria, Tex. . . 

 Guadalupe, Tex. 



Victoria, Tex. 



Do 



Do 



Do 



Total. 



July to August. 

 August 



1903. 



June 



June to August 



August to September. 



1904. 



June to September 



1,125 

 387 



334 

 873 

 368 



951 



4.03S 



360 



ins 



106 

 358 

 L92 



32.0 

 28.0 



41.0 

 52. 



49.3 



It seems safe to conclude that throughout the season fully one-third 

 of the squares which fall after receiving weevil injury may be expected 

 to produce weevils. 



» From Bui. 51, Bureau of Entomology, p. 92. 



