26 



BULLETIN 231, U. S. DEPARTMENT OF AGRICULTURE. 



NUMBER OF EGGS DEPOSITED FIRST DAY OF OVD?OSITION. 



The number of eggs deposited the first day of oviposition by each 

 female in all series varied from 1 to 12 with an average of 3 eggs for 

 the 58 females observed during the season. 



For typical grandis the number varied from 1 to 12 with an aver- 

 age of 3 eggs. 



For typical thurberise the number varied from 1 to 10 with an 

 average of 3.4 eggs. 



The number for the mating of infertile female thurberise and male 

 grandis varied from 1 to 2 with an average of 1.6 eggs. The num- 

 ber for the mating of infertile female grandis and male thurberise, 

 varied from 1 to 4 with an average of 2 eggs. 



PERIOD FROM THE DEPOSITION OF LAST EGG TO DEATH. 



The period from the deposition of the last egg to the death of the 

 female in all series varied from 10 days to death on the same day that 

 the last egg was deposited. This death on the last day of deposition 

 was observed 5 times during the season. The average of the 42 cases 

 observed was 3.1 days. 



For the different series of typical grandis this period varied from 

 10 days to death on the last day of deposition. The average was 

 3.2 days. 



For typical thurberise- this period varied from 3 to 7 days with an 

 average of 5.2 days. 



For the mating of female grandis and male thurberise the period 

 varied from 1 to 5 days with an average of 2.4 days. 



For the mating of female thurberise and male grandis the period 

 varied from 3 days to death on the last day of oviposition. The 

 average was 1.8 days. 



CESSATION OF OVIPOSITION BY HIBERNATED WEEVILS. 



In connection with the discussion of early or late planting to escape 

 the attack of the weevil it is interesting to note the time of cessation 

 of oviposition by early hibernated weevils. The accompanying 

 table (Table XVI) shows the date of the last egg deposited by each 

 of the first twelve hibernated females collected in the spring. Here 

 it is seen that the last egg ranged from May 29 to July 22. 



Table XVI. — Dates of cessation of oviposition of fust hibematedfemales of the boll weevil. 



Date collected. 



MayS.. 

 Do 

 Do 

 Do 

 Do 



May 20 

 Do 



Date 

 stopped 

 ovipos- 

 iting 



May 2<1 

 June 4 

 Juno 10 



June :".' 

 July in 

 June II 

 June 15 



Dale collected. 



May 20 



Do 



Do 



Do 



May 10 



Earliest date stopped 

 Latesl dale stopped. . 



Date 



slopped 

 ovipos- 

 iting. 



July 12 

 July 22 



July 8 



Do. 

 June 1 1 

 May 29 



July 22 



