20 BULLETIN 231, U. S. DEPAEIVIEXT OF AGEICTTLTEEE. 



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





Oviposition. 



Total 

 eggs. 



Eggs per day 





Mean 



Number of females. 



Started, t Ended. 



Period. 



Average. 



Maxi- 

 mum. 



ture for 

 period. 





Sept. 

 Sepr. 

 Sept. 

 ...do. 



7 

 3 

 2 



Sept. 7 

 Oct. 6 

 Oct. 1 

 Oct. 2 

 Oct. 6 



Days. 



34 

 30 

 31 

 33 



1 



173 



73 



90 



76 



1.0 

 5.1 

 2.4 

 3.0 

 2.3 





1 



i; 

 n 



8 

 8 



° F. 



1 



77.6 



1 



77.3 



1 



77.4 



1 



Sept. 



4 



77.4 







12S 



412 





















Average 



32 



103 



3.2 



5.1 

 2.3 















77.4 









34 

 30 



173 

 • 3 





17 

















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, the 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 ah other series. On the 

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

 time gave better deposition records. 



Eesults of the mating of male of A. g. thurberiae and female of A. 

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

 field were placed with male ftiuroerix 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 progeny 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 2S9.5 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 tliurberise on cotton squares immediately after emergence. 

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

 these matincrs are shown in Table XII. 



