20 BULLETIN 231, U. S. DEPARTMENT OF AGRICULTURE. 



Table XI. — Fecundity of typical A. g. thurberise. 





Oviposition. 



Total 

 eggs. 



Eggs per day. 



Mean 

 tempera- 

 ture for 

 period. 



Number of females. 



Started. 



Ended. 



Period. 



Average. 



Maxi- 

 mum. 



li 



Sept. 7 

 Sept. 3 

 Sept. 2 

 ...do 



Sept. 7 

 Oct. 6 

 Oct. 1 

 Oct. 2 

 Oct. 6 



Days. 

 1 



34 

 30 

 31 

 33 



1 



173 



73 



90 



76 



1.0 

 5.1 

 2.4 

 3.0 

 2.3 



1 



17 

 11 

 8 

 8 



° F. 



1 



77.6 



1.., 



77.3 



1 



77.4 



1 



Sept. 4 



77.4 









Total 





128 



412 























32 



103 











3.2 

 5.1 





77.4 







34 

 30 



173 

 73 



17 









2.3 8 





1 











i Owing to the fact that this female deposited only one egg, the record is not included in the averages 

 and summary given. 



Five pairs were mated, and while four females deposited fairly 

 well, trie other deposited only one egg and is not considered in the 

 following discussion. The total number of eggs deposited by these 

 females ranged from 73 to 173, with an average of 103. The average 

 per day ranged from 2.3 to 5.1, with an average of 3.2, and the max- 

 imum in one day was 17. All of these records are very low in com- 

 parison with the results of practically all other series. On the 

 other hand, the thurberise females mated with grandis males at this 

 time gave better deposition records. 



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

 grandis. — In June two hibernated grandis females collected in the 

 field were placed with male tliurberise on cotton squares. As these 

 females were undoubtedly fertilized by grandis males before being 

 isolated, this series did not result in positive proof of cross breeding, 

 but, as the weevils copulated freely, the later progeiry were quite 

 probably hybrids. 



These two females deposited 192 and 387 eggs, respectively, with 

 an average of 7.1 and 7.9 each per day. The average total number 

 of eggs per female was 289.5 and the daily average was 7.6. The 

 maximum number of eggs per day was 16 for each female. On the 

 whole this fecundity is quite high and the females were surely refer- 

 tilized by the new type of males. 



In September three known infertile females of grandis were mated 

 with male thurberise on cotton squares immediately after emergence. 

 This resulted in the positive crossing of the two. The results of 

 these matings are shown in Table XII. 



