22 BULLETIN 231, U. S. DEPARTMENT OE AGRICULTURE. 



Here again the total eggs deposited was quite low and the average 

 eggs per day was likewise low. However the fecundity was quite 

 high enough to equal many of the grandis females depositing at the 

 same time; consequently there seems little reason to believe that 

 the fecundity of thurberise is less than that of grandis. 



Results of the mating of progeny of male of thurberise and female 

 of grandis. — In the latter part of June three pairs of weevils reared 

 from eggs deposited by doubtful crosses of male thurberise and female 

 grandis were mated on cotton squares. Two pairs were placed 

 together in one jar and allowed to continue deposition until the 

 normal cessation. These two females deposited a total of 100 eggs 

 and averaged 4.3 per day. The maximum number in one day was 



14 eggs. The other female was allowed to continue oviposition for 

 18 days, and in this time she deposited a total of 143 eggs at the 

 rate of 8 eggs per day. The maximum number for one day was 



15 eggs. 



Results of the mating of progeny of male of grandis and female of 

 thurberise. — In July two pairs of weevils reared from eggs deposited 

 by doubtful crosses of male grandis and female thurberise were mated 

 on cotton squares. Owing to the shortage of squares these weevils 

 were stopped after having deposited for 17 and 5 days, respectively. 

 The first female deposited a total of 131 eggs at the rate of 7.3 per 

 day, with a daily maximum of 15, and the second deposited 48 eggs 

 at the rate of 9.6 per day, with a daily maximum of l4. 



MAXIMUM NUMBER OF EGGS PER DAY. 



The maximum number of eggs deposited in 1 day by any female 

 was 26. A first generation grandis female emerging June 8 deposited 

 this number of eggs in cotton squares July 2. The mean temperature 

 was 81.1° F. and the mean humidity was 68 per cent for the oviposi- 

 tion day involved. The previous record for 1 day's deposition (20 

 eggs) was exceeded many times by quite a number of females. 



The maximum number of eggs deposited by typical thurberise on 

 cotton squares was 17. This number was deposited September 8 at 

 a mean temperature of 86.4° and a mean humidity of 78 per cent for 

 the oviposition day. 



The maximum for the mating of infertile female thurberise and 

 male grandis was 13 eggs. This number was deposited September 10 

 at a mean temperature of 81.4° and a mean humidity of 83.5 per cent 

 for the oviposition day. 



The maximum for the mating of infertile female grandis and male 

 thurberise was 8 eggs. This number was deposited September 16 at a 

 mean temperature of 76° and a mean humidity of 77.5 per cent for 

 the oviposition day. 



