BECENT STUDIES OF THE MEXICAN COTTON BOLL WEEVIL. 21 

 Table XII. — Fecundity of positive crosses of male of thurberix and female of grandis. 





Number 



of 

 females. 



Oviposition. 



Total 

 eggs. 



Eggs per day. 



Average 



Total, average, etc. 



Started. 



Ended. 



Period. 



Average. 



Maxi- 

 mum. 



ture for 

 period. 





1 

 1 



1 



Sept. 7 

 Sept. 4 

 Sept. 5 



Oct. 24 

 Sept. 11 

 Sept. 17 



Days. 

 48 

 38 

 13 



115 

 43 

 69 



2.4 

 1.1 

 5.3 



7 

 4 

 8 



°F. 



74.4 

 77.8 

 78.9 



Total 



3 



99 

 33 



227 

 75.6 





























2.3 

 5.3 

 1.1 





76.3 











48 

 13 



115 

 43 



8 

 4 

























The total oviposition of these females was surprisingly low, ranging 

 from 43 to 115 and averaging 75.6 eggs per female. The average 

 number of eggs per day was only 2.3 and the maximum number of 

 eggs in one day was only 8. 



Results of the mating of male of A. grandis and female of A. g. 

 thurberix. — In June two of the female thurberix received were mated 

 on cotton squares with male grandis collected in the field. As 

 these females had been shipped with thurberix males, there was a 

 possibility of their being fertile at the time of placing with grandis 

 males, but refertilization probably occurred. 



These females deposited 115 and 130 eggs respectively, with an 

 average of 122.5 each. The average per day was 3.4 and 3.9 eggs, 

 making an average of 3.6 each for the two females. The maximum 

 in one day was 7 eggs. 



In the fall three females of thurberix reared from Thurberia bolls 

 received from Arizona were mated with the males of grandis on 

 cotton squares immediately after emergence. Thus positive crosses 

 were secured. The activities of these females are shown in Table 

 XIII. 



Table XIII. — Fecundity of 



crosses of female of thurberix by male of grandis. 





Number 



of 

 females. 



Oviposition. 



Total 

 eggs. 



Eggs per day. 



Mean 



Total, average, etc. 



Started. 



Ended. 



Period. 



Average. 



Maxi- 

 mum. 



ture for 

 period. 





1 

 1 



1 



Sept. 6 

 Sept. 3 

 ...do. . .. 



Oct. 27 

 Oct. 2 

 Oct. 8 



Days. 

 52 

 30 

 36 



95 

 146 

 102 



1.8 

 4.8 

 3.0 



8 

 13 



8 



°F. 

 73.9 

 77.3 

 80.2 



Total 



3 



118 

 39.3 



343 

 114.3 





























2.9 



4.8 

 1.8 





76.7 











52 

 30 



146 



95 



13 



8 

























