COTTON BOLL WEEVIL IN THE MISSISSIPPI VALLEY. 



19 



The number of eggs per female ranged from 6 to 72, with an average 

 of 24.4, while the average per female per day was 1.4 and the maxi- 

 mum per day was 5. The oviposition period ranged from 10 to 59 

 days, with an average of 31.4 days. 



From this and the preceding series the greatly reduced fecundity 

 of thurberiae under the artificial condition prevailing at the Tallulah 

 laboratory is quite evident. 



Fecundity of bred grandis females mated with male thurberiae. — Late 

 in June 12 newly emerged female grandis of the first generation were 

 mated with hibernated male thurberiae on cotton squares. (Table 

 XII.) 



Table XII. — Fecundity of bred females of Anthonomus grandis mated with male A. g. 

 thurberiae on cotton squares. 





Date ovi- 

 position 

 began. 



Date ovi- 

 position 

 ended. 



Ovipo- 

 sition 

 period. 



F.ggs deposited. 



Date installed. 



Total. 



Per day. 



Maxi- 

 mum per 

 day. 





June 29 

 Aug. 2 

 July 2 

 Aug. 4 

 June 28 

 Aug. 1 

 June 28 

 Aug. 5 

 June 30 

 Aug. 3 

 June 28 

 July 1 

 June 28 



July 7 

 Sept. 8 

 July 28 

 Aug. 31 

 July 10 

 Aug. 28 

 July 7 

 Sept. 10 

 July 13 

 Sept. 19 

 July 3 

 Aug. 7 

 Aug. 10 



Days. 



9 

 38 

 27 

 28 

 13 

 28 

 10 

 37 

 14 

 48 



6 

 38 

 44 



35 

 134 



124 

 19 

 29 



100 

 31 

 87 

 32 

 87 

 13 



113 



166 



3.9 

 3.5 

 4.6 

 .7 

 2.2 

 3.6 

 3.1 

 2.4 

 2.3 

 1.8 

 2.2 

 3.0 

 3.8 



7 



July 27 



9 



June 22 



8 



July 27 



2 





7 



July 29 J . . . -• 



8 



June 22 



5 



July 27 



6 



June 22 



5 



July 27 



6 



June 22 



6 



Do 



7 



Do 



15 







Total 



312 

 26 



48 

 6 



870 



72.5 

 166 



13 













2.8 

 4.6 



.7 











15 











1 







i A complete record was not secured from this female owing to its escape on August ; 

 the figures are not included in the totals and averages. 



), and consequently 



The total eggs per female varied from 13 to 166, with an average of 

 72.5, and the average per female per day was 2.8. The oviposition 

 period ranged from 6 to 48 days, with an average of 26 days. 



The hybrid progeny reared from these eggs were mated on cotton 

 squares and laid fertile eggs. 



Fecundity of female thurberiae mated with male grandis. — In June 

 18 hibernated females of the variety thurberiae were mated with an 

 equal number of male grandis on cotton squares. The detailed 

 results are shown in Table XIII. 



